NOW Supplements Vitamin D-3

Vitamin D's role in heart health

Based on 18 Researches

Haghighatafshar M, Shekasteband B, Firuzyar T, Etemadi Z, Farhoudi F, et al. The Impact of Vitamin D Deficiency on Coronary Artery Disease Severity Based on Myocardial Perfusion Imaging: A Cross-Sectional Study. Iran J Med Sci. 2025;50:31. doi:10.30476/ijms.2024.101112.3372

We examined how low levels of vitamin D (Vit D) could impact the severity of heart disease, specifically looking at myocardial ischemia. Our study involved two hundred patients who underwent myocardial perfusion imaging at Namazi Hospital in Shiraz, Iran, in 2019. We assessed both the severity of ischemia in patients and their vitamin D levels.

The results revealed a clear pattern: when vitamin D levels dropped below 10 ng/mL, patients showed a significant increase in severe myocardial ischemia. Conversely, in patients with higher levels of vitamin D, we did not find any substantial association with abnormalities in heart imaging. This indicates that maintaining adequate vitamin D levels may play a role in reducing heart disease severity.

Overall, our findings suggest that vitamin D deficiency, especially levels below 10 ng/mL, could contribute to more severe heart conditions. This could prompt health care providers to consider monitoring and addressing vitamin D levels in patients at risk for heart disease.

Fewer colds

Most Useful Review

78 people found this helpful

Simply Excellent! Vitamin D3 plays a vital role in the body, acting like a hormone for calcium absorption, immunity and regulating blood pressure. Its deficiency can lead to colds and depression. I take it daily before lunch for maximum absorption.

Updated: Mar 2026

Menopause details

Vitamin D supports bone health

Based on 10 Researches

G Siregar MF, Jabbar F, Effendi IH, Alhair T, Prabudi MO, et al. Correlation between serum vitamin D levels and bone mass density evaluated by radiofrequency echographic multi-spectrometry technology (REMS) in menopausal women. Narra J. 2024;4:e452. doi:10.52225/narra.v4i1.452

We aimed to uncover the relationship between vitamin D levels and bone mineral density (BMD) in menopausal women, a group particularly vulnerable to osteoporosis due to hormonal changes. To achieve this, we conducted a thorough study involving 32 participants, all of whom were menopausal women without a history of hormone replacement therapy or vitamin D supplementation.

Throughout our research, we measured the participants' serum vitamin D levels and evaluated their bone density using a technique called radiofrequency echographic multi-spectrometry (REMS). Our findings revealed a significant positive correlation between vitamin D levels and BMD—indicating that higher vitamin D levels were associated with better bone density.

This suggests that maintaining adequate vitamin D levels might be crucial for preserving bone health during menopause. Given the particular vulnerability of this demographic to osteoporosis, our study underscores the importance of monitoring and potentially supplementing vitamin D to support bone health in menopausal women.

Overall, we believe our findings contribute to the conversation around menopause management by highlighting the role of vitamin D in promoting healthier bones, and we suggest that REMS could serve as a valuable tool in assessing these changes in postmenopausal women.

Improves menopause symptoms

Most Useful Review

58 people found this helpful

I absolutely love this vitamin product. It effectively enhances both my physical and mental well-being, helps maintain a healthy weight, and alleviates menopause symptoms. It has even won FDA approval.

Updated: Mar 2026

Bruise details

Excellent vitamin D in a suitable dosage for children! My child swallows the capsule easily. I've noticed an improvement in mood, the bruises under their eyes have vanished, and they are very active now! I highly recommend it!

Chemotherapy details

Vital during treatment

Excellent vitamin D! I took it consistently throughout the year as a cancer patient receiving chemotherapy. The chemical treatments drained my vitamin D levels, and my doctor recommended this supplement. After testing, my levels improved significantly, and I've since reduced my dose to once a week. Vitamin D is truly essential in our lives.

Chest Pain details

Vitamin D deficiency affects symptoms

Based on 8 Researches

Khater WA, Alfarkh MA, Allnoubani A. The Association Between Vitamin D Level and Chest Pain, Anxiety, and Fatigue in Patients With Coronary Artery Disease. Clin Nurs Res. 2023;32:639. doi:10.1177/10547738221126325

We aimed to understand how vitamin D deficiency (VDD) might influence symptoms like chest pain, anxiety, and fatigue in people living with coronary artery disease (CAD). In our investigation, we collected data from 90 CAD patients, focusing on their vitamin D levels and experiences with these symptoms.

The findings were quite revealing. A significant 80% of the participants were found to have low vitamin D levels. Interestingly, we discovered that lower vitamin D levels were linked to increased chest pain and heightened anxiety and fatigue. Specifically, there were strong negative relationships noted: as vitamin D levels dropped, chest pain, anxiety, and fatigue scores rose.

This suggests that addressing vitamin D deficiency might be an important step for managing cardiac-related symptoms in patients with CAD. As this connection unfolds, it seems valuable for healthcare providers to monitor vitamin D levels in CAD patients and consider interventions to correct deficiencies.

Pain eliminated

Most Useful Review

An excellent vitamin! After drinking vitamin D3 for two months, the ache in my hip joint has disappeared. I recommend it to everyone.

Updated: Mar 2026

Chronic Cough details

Improved immune response

17 people found this helpful

Impressive! I believe vitamin D has significant immunomodulatory effects. My older brother had urticaria due to an overactive immune reaction, but he no longer suffers from it after taking this supplement. My younger brother frequently felt tired due to low vitamin D levels linked to a thyroid autoimmune condition. He’s much better now. It's advised to take a moderate dose throughout winter for optimum absorption, and it's best taken with a fat-rich meal rather than before bedtime, as it can interfere with melatonin levels.

Pelvic Pain details

Pelvic pain alleviated

7 people found this helpful

Great. I suffered from terrible pelvic pain, thinking it was a spine issue. Luckily, after watching Dr. Berg's video, I realised it might be due to vitamin D deficiency. I took 5000 iu, and the next day, the pain disappeared.

Vitamin D3 reduces early reflux inflammation

Reflux details

Wei J, Zhang J, Jiang Y, Lian T, Zhang P, et al. Elevated Pro-inflammatory Cytokine Levels in Acute Reflux Esophagitis Are Reduced by 1,25 Dihydroxy Vitamin D3. In Vivo. 2023;37:79. doi:10.21873/invivo.13056

We investigated how Vitamin D3 affects inflammation caused by reflux esophagitis—a condition where stomach acid irritates the esophagus. In our study, we used 70 male rats, dividing them into groups to examine the impact of Vitamin D3 at different doses on inflammation levels.

Our findings revealed that the levels of pro-inflammatory cytokines like IL-1β, IL-6, and IL-8 were significantly elevated in cases of acute reflux esophagitis. However, when we treated these rats with Vitamin D3, we observed that the inflammation markers decreased notably in the acute cases, while there wasn’t any significant change in the chronic cases.

Despite some improvements in cytokine levels with Vitamin D3, we noted that the overall morphological damage to the esophagus remained unchanged. Interestingly, while Vitamin D3 did raise serum calcium levels, it didn’t seem to help repair esophageal damage in the longer-term chronic setting.

These results suggest that while Vitamin D3 has the potential to mitigate inflammation in early stages of reflux esophagitis, it does not offer a complete solution regarding the physical damage caused by the condition over time.

Effective alternative treatment

Most Useful Review

I was recently informed that Vitamin D is preferable to Vitamin C. Since I occasionally suffer from reflux, Vitamin D has been a remarkable alternative for me.

Updated: Mar 2026

Swollen Lymph Nodes details

4 people found this helpful

Wonderful! Effective! Initially, I took Ukrainian Vit. D3, then switched to this one, consumed it for three months, and repeated the analysis. The result after taking 78 is normal—I raised my levels twofold! I have problems with the thyroid gland (swollen lymph nodes), and I’m considering purchasing iodine here instead of Iodomarin. Overall, Vit. D3 is good and effective.

Whenever I sense I'm getting a cold with a slight runny nose or cough, I immediately take this vitamin, and the next day, the symptoms vanish. It’s been a true godsend, and I've ordered it for myself and my family multiple times.

Whooping Cough details

Abscess details

Vitamin D treatment reduces abscesses

Rotstein I, Katz J. Prevalence of periapical abscesses in vitamin D deficient patients. Am J Dent. 2021;34:163.

We examined how vitamin D deficiency relates to the occurrence of periapical abscesses. By analyzing hospital data, we found that patients with vitamin D deficiency had a significantly higher chance of developing these abscesses compared to those without the deficiency.

Interestingly, patients who received calciferol supplements demonstrated a marked reduction in the prevalence of abscesses. This suggests that vitamin D treatment may play a vital role in managing periapical abscesses, highlighting the importance for dentists to consider vitamin D levels in their patients.

Cysts disappeared

Most Useful Review

I'm truly an inositol beneficiary. The polycystic cysts that had persisted for many years vanished after I used myo-inositol for two months. The results from my latest examination revealed no signs of polycystic cysts anymore, allowing me to prepare for pregnancy normally. Sisters, go for it; it's really beneficial!

Updated: Mar 2026

Anemia details

Vitamin D3's role in anemia

Based on 10 Researches

Ahmad Fuzi SF, Su Peng L, Zabaha Zalbahar N, Ab Manan N, Mohamad Alwi MN. Effect of vitamin D3-fortified fruit juice supplementation of 4000 IU daily on the recovery of iron status in childbearing-aged women with marginally low iron stores: Protocol for an 8-week, parallel group, double-blind randomized controlled trial. PLoS One. 2022;17:e0265772. doi:10.1371/journal.pone.0265772

We conducted a study to see how vitamin D3 might help improve iron levels in women of childbearing age who had marginally low iron stores. Our approach involved a carefully designed 8-week randomized controlled trial, where 120 women aged between 19 and 40 were divided into two groups. One group received fruit juice fortified with 4000 IU of vitamin D3 daily, while the other had a placebo juice.

Throughout the study, we collected blood samples and monitored various health indicators every four weeks. We aimed to find out if the vitamin D3 supplementation could positively influence the iron status of the participants compared to the placebo.

Given the promising role of vitamin D in enhancing iron absorption, we hoped to uncover new insights into dietary strategies for managing iron deficiency. By observing the interaction over time between vitamin D levels and iron status, we aimed to provide valuable information on whether this fortification could serve as a practical alternative to traditional iron supplements.

As we gathered data, we explored the potential of vitamin D3 beyond its usual role, assessing if it could indeed help improve the anemia indicators in our target group.

Effective treatment

Most Useful Review

I was vitamin D deficient and took this supplement. I checked my levels afterward, and to my surprise, they improved. I took it consistently before meals, though some may require higher dosages.

Updated: Mar 2026

Anxiety details

Vitamin D3 aids anxiety reduction

Based on 22 Researches

Zaromytidou E, Koufakis T, Dimakopoulos G, Drivakou D, Konstantinidou S, et al. Vitamin D Alleviates Anxiety and Depression in Elderly People with Prediabetes: A Randomized Controlled Study. Metabolites. 2022;12. doi:10.3390/metabo12100884

We explored the effect of vitamin D3 supplementation on anxiety levels among elderly individuals diagnosed with prediabetes. In our study, we randomly assigned participants to receive either a weekly dose of 25,000 IU of vitamin D3 or a placebo, alongside general lifestyle recommendations. Over the course of 12 months, we measured anxiety levels using standardized assessments.

At both the six-month and twelve-month marks, the participants receiving vitamin D3 reported significantly lower anxiety levels compared to those who did not receive the supplementation. Specifically, scores measuring anxiety decreased from 38.02 to 32.35 in the vitamin D group, while control participants’ scores remained much higher throughout the study.

These results indicate that vitamin D3 could be a beneficial and safe option for alleviating anxiety in an older population already facing the challenges of prediabetes. The participants who had vitamin D deficiency or insufficiency at the start of the study experienced similar improvements, emphasizing the treatment's potential across various baseline vitamin D levels.

Overall, our findings support the idea that vitamin D supplementation can effectively help mitigate anxiety symptoms in older adults, and we believe further research is warranted to better understand the mechanisms at play.

Less anxiety

Most Useful Review

84 people found this helpful

After using this product for a month, I am impressed with the results. It has greatly impacted my life, improving my energy, mental strength, and even reducing my everyday stress and anxiety.

Updated: Mar 2026

Atrial Flutter details

Boosted energy levels

I had low vitamin D levels, leading to constant fatigue and atrial flutter, which left me feeling overwhelmed by the end of the day. After trying this vitamin with shock doses of 10,000, I felt a surge of strength and my heart didn’t trouble me anymore. I highly recommend this excellent vitamin D, but always consult your doctor before use.

Back Pain details

Vitamin D3 improves back pain

Based on 22 Researches

Ghai B, Bansal D, Kanukula R, Gudala K, Sachdeva N, et al. Vitamin D Supplementation in Patients with Chronic Low Back Pain: An Open Label, Single Arm Clinical Trial. Pain Physician. 2017;20:E99.

We sought to understand the role of vitamin D3 supplementation in alleviating chronic low back pain (CLBP). In a single-arm, open-label study at a tertiary care hospital, we worked with 68 patients suffering from CLBP for at least three months, each demonstrating a significant pain level on a visual scale alongside low vitamin D levels.

Participants received 60,000 IU of vitamin D3 weekly for eight weeks. We tracked pain intensity and functional disability at various stages: at the outset, and then at two, three, and six months post-supplementation. Notably, we witnessed a remarkable increase in vitamin D levels from an average of 12.8 ng/mL to 36.07 ng/mL in those eight weeks, with 66% of participants achieving normal vitamin D levels.

The benefits didn’t stop there. Patients reported a significant drop in their pain scores at all follow-up periods, improving from 81 to 36 on the scale. Functional ability also saw enhancement over time, proving the positive influence of vitamin D3 on both pain and everyday activities.

Overall, our findings suggest that vitamin D3 supplementation can be an effective avenue for improving pain intensity and functionality in individuals with low back pain, warranting further investigation through controlled clinical trials.

Reduced back pain

Most Useful Review

7 people found this helpful

I purchased this vitamin D at a good discount; the capsules are small and easy to take. Reports claim the benefits of vitamin D are significant; after taking it, my back pain stopped, and I hope it continues to help.

Updated: Mar 2026

Blood Clot details

Vitamin D counteracts blood clotting

Based on 16 Researches

Cimmino G, Conte S, Morello M, Pellegrino G, Marra L, et al. Vitamin D Inhibits IL-6 Pro-Atherothrombotic Effects in Human Endothelial Cells: A Potential Mechanism for Protection against COVID-19 Infection?. J Cardiovasc Dev Dis. 2022;9. doi:10.3390/jcdd9010027

Our research focused on understanding how Vitamin D (VitD) might influence blood clotting, especially in the context of COVID-19. We found that when human endothelial cells were exposed to IL-6—an inflammatory cytokine associated with severe COVID-19—it led to dysfunction in these cells. This dysfunction was marked by increased levels of Tissue Factor (TF) and cell adhesion molecules (CAMs), which promote blood clotting.

Remarkably, when we treated these endothelial cells with VitD, we observed a reversal of these harmful effects. VitD appeared to inhibit the expression of TF and CAMs and even modulated the levels of the ACE2 receptor, which is crucial for the entry of the virus into cells. Our findings suggest that VitD could play a protective role against the blood clotting complications associated with COVID-19 by counteracting IL-6's effects on endothelial cells.

Overall, this study paves the way for further research into VitD as a potential therapeutic option for mitigating thrombotic risks in COVID-19 patients.

Improved blood clotting

Most Useful Review

3 people found this helpful

Vitamin D3 helps normalise blood clotting, enhances insulin sensitivity, and prevents cholesterol buildup in blood vessels. It significantly boosted my immune system, and after just six months of taking D3 and K2, my previously bumpy nails improved.

Updated: Mar 2026

Depression details

Vitamin D3 improves depressive symptoms

Based on 30 Researches

Kaviani M, Nikooyeh B, Etesam F, Behnagh SJ, Kangarani HM, et al. Effects of vitamin D supplementation on depression and some selected pro-inflammatory biomarkers: a double-blind randomized clinical trial. BMC Psychiatry. 2022;22:694. doi:10.1186/s12888-022-04305-3

We conducted a double-blind randomized clinical trial to explore the effects of vitamin D3 supplementation on depression. Our study involved 56 adults with mild to moderate depression, who were assigned to either a vitamin D group or a placebo group. Over the course of eight weeks, the vitamin D group received a high dose of 50,000 IU cholecalciferol every two weeks, while the control group received a placebo.

After the treatment period, we observed that the participants who received the vitamin D3 experienced a significant reduction in depression severity, as measured by the Beck Depression Inventory-II. Interestingly, this improvement in mood occurred independently of any changes in inflammatory biomarkers like IL-1β, IL-6, and hs-CRP, which we also assessed during the study.

This indicates that while vitamin D supplementation may positively impact depressive symptoms, its effects are not directly linked to the inflammatory markers we evaluated. Our findings suggest that vitamin D3 could be a helpful addition to depression treatment strategies, particularly in individuals with low vitamin D levels.

Boosted immunity

Most Useful Review

203 people found this helpful

Good afternoon! These Vitamin D3 capsules are fantastic for boosting immunity in a digestible liquid form. Living in Siberia, we suffer from vitamin D deficiency. We've noticed a positive effect during the ARVI season, as we fell ill less frequently and more mildly. The whole family takes it, and I’ve been on this dosage for over a year. It helps alleviate depression due to the lack of sun, increases vitality, and without it in the morning, I don't feel like myself.

Updated: Mar 2026

Dizziness details

Vitamin D treatment reduces BPPV

Based on 21 Researches

Talaat HS, Kabel AM, Khaliel LH, Abuhadied G, El-Naga HA, et al. Reduction of recurrence rate of benign paroxysmal positional vertigo by treatment of severe vitamin D deficiency. Auris Nasus Larynx. 2016;43:237. doi:10.1016/j.anl.2015.08.009

We sought to understand the impact of severe vitamin D deficiency on benign paroxysmal positional vertigo (BPPV), a common cause of dizziness. Previous studies showed a connection between low vitamin D levels and both the onset and recurrence of BPPV, but none had conclusively demonstrated that addressing this deficiency could lessen the recurrence of symptoms.

To examine this further, we included patients diagnosed with unilateral, idiopathic posterior canal BPPV and severe vitamin D deficiency, indicated by levels of 25-hydroxyvitamin D3 at or below 10 ng/ml. After thorough evaluations including hearing tests and balance assessments, we prescribed vitamin D therapy to our participants.

Over the following months, we monitored the changes in their vitamin D levels and followed up with them for 18 months to observe any recurrence of dizziness. Our findings revealed that patients who showed an improvement in their vitamin D levels experienced a significant reduction in the recurrence of BPPV symptoms.

This suggests that by addressing vitamin D deficiency, we can potentially offer a more effective approach to managing BPPV—lessening those troublesome dizzy spells that can really impact quality of life.

No more dizziness

Most Useful Review

90 people found this helpful

I’m not typically one for supplements, but after experiencing dizziness with a cold, I tried this vitamin. I’m pleased I did! After about two months, my colds have vanished and my energy levels are outstanding.

Updated: Mar 2026

Knee Pain details

Vitamin D3 shows promise for knee OA

Based on 26 Researches

Divjak A, Jovanovic I, Matic A, Lucic AT, Gajovic N, et al. The influence of vitamin D supplementation on the expression of mediators of inflammation in knee osteoarthritis. Immunol Res. 2023;71:442. doi:10.1007/s12026-022-09354-0

We explored the potential benefits of vitamin D3 supplementation in alleviating knee pain associated with osteoarthritis (OA). In this open-label clinical trial, we assessed the effects of daily doses of 4000 IU vitamin D3 over three months in 80 patients suffering from knee OA.

Our findings revealed notable improvements in pain levels and overall physical function. The patients showed significant reductions in pain scores measured by the Visual Analog Scale (VAS) and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) subscores after the treatment period. Remarkably, 86.7% of those treated responded positively to the therapy.

Interestingly, we observed changes in systemic cytokine levels: while some pro-inflammatory markers increased, others, including TNF-α and IL-17, showed significant reductions. This suggests that vitamin D3 not only helps with pain relief but also may influence inflammatory processes in the body.

Overall, our results indicate that vitamin D3 supplementation could be a promising therapeutic option for managing symptoms of knee OA. Nonetheless, future research should further investigate the role of specific inflammatory mediators, like IL-33, in the progression of knee osteoarthritis.

No more knee pain

Most Useful Review

102 people found this helpful

I consistently took vitamin D and recently realised that my knee pain is gone. I can now bend my knees without hearing any crunching noises, confirming the importance of vitamin D for health.

Updated: Mar 2026

Lupus details

Vitamin D enhances immune response in lupus

Based on 20 Researches

Mariz HA, Sato EI, Cardoso PRG, Gonçalves R, Duarte ALBP, et al. Vitamin D Presented In Vitro Immunomodulatory Property on T Lymphocyte-Related Cytokines in Systemic Lupus Erythematosus. Inflammation. 2023;46:730. doi:10.1007/s10753-022-01768-0

We explored how vitamin D influences immune responses in women with systemic lupus erythematosus (SLE). Blood samples from 27 patients were used to isolate immune cells and examine the impact of 1,25 dihydroxyvitamin D3 on various cytokines.

Our findings revealed that this form of vitamin D significantly reduced certain pro-inflammatory cytokines while simultaneously increasing beneficial ones, suggesting its potential to improve immune regulation in lupus. However, not all cytokine levels were affected.

Overall, vitamin D shows promise in helping manage inflammatory responses related to SLE.

Improved energy levels

Most Useful Review

I have been taking this vitamin D3 for a few months, and I have noticed a significant improvement in my energy and mood. I highly recommend it for anyone looking for a vegan-friendly option. The quality is excellent, and the size is suitable. I was advised to take this 2000 IU dosage, which has greatly enhanced my immunity as I cannot be out in the sun due to my lupus. The packaging is also good.

Updated: Mar 2026

Polycystic Ovary Syndrome details

Relieved dermatitis symptoms

20 people found this helpful

My diagnosis is PCOS with impaired glucose tolerance, which leads to atopic dermatitis. After reading that vitamin D3 could help, I started taking it for over a month. To my joy, after just three days, my dermatitis did not appear. Even after indulging in buns, it stayed away for the first time in a year and a half. This was a miracle for me!

Rheumatoid Arthritis details

Vitamin D3 reduces rheumatoid arthritis inflammation

Based on 21 Researches

Zhu W, Zhu Y, Zhang S, Zhang W, Si Z, et al. 1,25-Dihydroxyvitamin D regulates macrophage activation through FBP1/PKR and ameliorates arthritis in TNF-transgenic mice. J Steroid Biochem Mol Biol. 2023;228:106251. doi:10.1016/j.jsbmb.2023.106251

We investigated the role of 1,25-Dihydroxyvitamin D, commonly known as vitamin D3, in managing rheumatoid arthritis (RA). Our study focused on how this vitamin influences macrophage activation, especially in patients with RA.

We found that vitamin D3 has a unique ability to suppress M1 macrophage polarization, a process that intensifies inflammation and is linked to RA symptoms. The treatment reduced levels of various inflammatory markers in macrophages, which are crucial players in our immune response.

In controlled experiments using THP-1 cells (a type of human immune cell), vitamin D3 enhanced the expression of fructose-1,6-bisphosphatase 1 (FBP1). This interaction was significant because FBP1 helps manage the degradation of another protein called PKR, which is involved in the inflammatory response.

By interacting with FBP1 and PKR, vitamin D3 diminishes the inflammatory activity of macrophages, suggesting a pathway for reducing arthritis symptoms. We also observed promising effects in TNF-transgenic mice, where vitamin D3 treatment alleviated arthritic manifestations and promoted a healthier macrophage profile in cells taken from swollen joints.

Overall, our findings affirm the potential of vitamin D3 as a beneficial treatment option for individuals struggling with rheumatoid arthritis.

Improved energy levels

Most Useful Review

90 people found this helpful

I was sceptical about the claims but decided to give this vitamin a try for health benefits. I fully recovered from some serious illnesses like rheumatoid arthritis and bronchitis, which had plagued me. I now have more energy, an improved mood, and greater vitality, which is amazing.

Updated: Apr 2025

Sinusitis details

Vitamin D helps alleviate CRS symptoms

Baruah B, Gupta A, Kumar A, Kumar A. The role of oral vitamin D3 supplementation in the treatment of Chronic Rhinosinusitis in adults with Vitamin D deficiency. J Family Med Prim Care. 2020;9:2877. doi:10.4103/jfmpc.jfmpc_448_20

We explored the potential benefits of vitamin D supplementation for individuals suffering from Chronic Rhinosinusitis (CRS), a common condition marked by inflammation of the nose and sinus linings. In a study involving 200 patients with vitamin D deficiency, we divided participants into two groups: one receiving oral vitamin D supplements and the other receiving a placebo.

Over the course of three months, we observed a significant increase in vitamin D levels among those taking the supplements, rising from an average of 12.31 ng/ml to 29.71 ng/ml. Additionally, the participants reported a notable decrease in symptoms derived from their Total Nasal Symptom Scores (TNSS), which fell by an average of 10.65 points.

This study indicates that many CRS patients suffer from vitamin D deficiency and that supplementation can effectively alleviate their symptoms. Ultimately, our findings suggest that addressing vitamin D levels could become a valuable part of the treatment strategy for CRS.

Sinusitis relief

Most Useful Review

In today's world, money is tight, so this company's vitamin D3 is both economical and effective. I have been taking it for two years, and thanks to it, my chronic sinusitis has ceased. Whenever I feel unwell, I supplement with zinc from the same brand, and I haven't been ill in about two years, which is fantastic for a postpartum mother.

Updated: Mar 2026

Adenoiditis details

Improved health quality

I've been taking vitamin D 5000 IU and MK7 for 4 months, and my immunity has significantly improved! I used to get ill every month in winter, requiring antibiotics for throat infections, but now my health has dramatically enhanced. With Hashimoto’s, maintaining vitamin levels is crucial for me. My hair loss has stopped, and new growth has occurred. I've ordered a 2000 IU version for spring, hoping it will be equally effective. The capsules are small and easy to swallow—high-quality ingredients, with one per day recommended. Always monitor your blood levels to adjust your dosage. The packaging was perfect, and the effects have truly benefited my overall health, including my bones.

Arthritis details

Vitamin D aids rheumatoid arthritis

Hijjawi N, Tout FS, Azaizeh B, Aljaafreh B. The role of vitamins D, B12, C, and K in modulating inflammation and disease management in rheumatoid arthritis: a comprehensive review. Clin Rheumatol. 2025;44:591. doi:10.1007/s10067-024-07285-9

We explored how vitamin D plays a role in managing rheumatoid arthritis (RA), a condition that causes joint inflammation and discomfort. It's been found that many people with RA often suffer from vitamin D deficiency, which may worsen their symptoms and overall disease severity.

Our review indicates that vitamin D could help modulate immune responses and lower inflammation levels. Supplementing with vitamin D has shown potential in improving various disease activity markers, signaling that it could be a valuable addition to treatment strategies for RA.

Besides vitamin D, we also looked at other important vitamins like B12, C, and K. While vitamin D stands out for its immune benefits, B12 supports energy and neurological health, C helps with collagen production and inflammation reduction, and K contributes to bone health.

Together, these vitamins create a comprehensive approach to managing RA, emphasizing the need for further research to determine the best ways to use them effectively.

Preventative measure

Most Useful Review

Vitamin D3 deficiency can lead to rheumatic conditions. I suggest taking it year-round for health. The capsules are small and pleasant. I also take omega and iodine supplements from this brand for my overall health.

Updated: Mar 2026

Bacterial Infection details

324 people found this helpful

Now Foods Vitamin D-3 was prescribed by my doctor after we experienced a covid infection. Within three weeks, I noticed we managed to overcome the infection swiftly, lasting around 7 days without any pneumonia or complications. I firmly believe Vitamin D-3 significantly contributed to our recovery. We plan to continue taking it for at least six months.

Cancer details

Vitamin D3 offers anti-cancer benefits

Based on 14 Researches

Ezcurra-Hualde M, Zalba S, Bella Á, Arrizabalaga L, Risson A, et al. Liposomal encapsulation of cholecalciferol mitigates toxicity and delays tumor growth. Front Immunol. 2025;16:1529007. doi:10.3389/fimmu.2025.1529007

We investigated the potential of vitamin D3, also known as cholecalciferol, in combating cancer while addressing concerns about its toxicity at higher doses. This study focused on enhancing the effectiveness of vitamin D3 through a clever method called liposomal encapsulation, which helps minimize side effects.

We prepared liposomal vitamin D3 (VD-LP) and conducted various tests to understand its capabilities. We found that this encapsulated form not only maintained high efficiency but also demonstrated improved stability. Our analyses showed that VD-LP had strong effects against cancer cells from colorectal, breast, and prostate cancers. Remarkably, it affected gene expression in immune cells, boosting elements that help fight infections and support the body's defenses.

Notably, VD-LP did a great job slowing tumor growth in mice and improved their survival rates without causing adverse effects like hypercalcemia, which is often a concern with regular vitamin D3 use. This evidence indicates that liposomal encapsulation of vitamin D3 could offer an effective cancer treatment strategy while minimizing unwanted side effects.

We believe this may pave the way for further research and clinical applications, showcasing vitamin D3 as a valuable addition to cancer therapy.

7.5

Energy boost

Most Useful Review

Vitamin D3 promotes calcium absorption, strengthens bones, and boosts immunity, making us less prone to illnesses in colder months. There’s increasing evidence linking D3 to cancer protection. I find the capsules easy to swallow. It’s advised to take them in the morning to prevent sleep disturbance. My experience with this dose has been positive.

Updated: Mar 2026

Celiac details

6 people found this helpful

My family's hay fever symptoms dropped by 90% after starting vitamin D alongside a gluten-free diet. Previously, I faced severe symptoms. With vitamin D supplementation, I've been able to manage better without hospital visits or over-the-counter medications. I believe avoiding wheat flour is most effective, with vitamin D playing a significant supportive role.

Cholecystitis details

Effective dosage noted

It seems that vitamin D dosages under 5,000 IU are rather ineffective. Regular intake of 1,000–2,000 IU won't yield benefits and could lead to kidney stones. It's vital to check your levels; if under 30, I recommend starting at 10,000 IU, but if over 30, 5,000 IU suffices. From personal experience, I took 5,000 IU but switched to 10,000 IU and my levels soared to 90, particularly important as I have arthritis.

Common Cold details

Vitamin D reduces cold severity

Based on 7 Researches

Harrison SE, Oliver SJ, Kashi DS, Carswell AT, Edwards JP, et al. Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training. Med Sci Sports Exerc. 2021;53:1505. doi:10.1249/MSS.0000000000002604

We explored the connection between vitamin D levels and the frequency of upper respiratory tract infections (URTI) in physically active individuals throughout different seasons. In our research, we observed over 1,600 military recruits during their basic training, noting that only 21% were vitamin D sufficient during winter. Alarmingly, those who had sufficient vitamin D levels were found to be 40% less likely to experience URTIs compared to their deficient counterparts, suggesting that maintaining adequate vitamin D may be crucial for better respiratory health during demanding training periods.

Building on these findings, we conducted a follow-up study with 250 recruits, where we implemented various vitamin D supplementation strategies. Participants received either a placebo, simulated sunlight exposure, or oral vitamin D3 supplementation. The results were promising: vitamin D helped alleviate the severity of URTI symptoms and significantly reduced the number of days experiencing a cold. Notably, both sunlight and dietary supplementation were equally effective in boosting vitamin D levels and improving outcomes.

Overall, achieving vitamin D sufficiency can markedly reduce the burden of URTIs, particularly in physically demanding scenarios such as military training.

Reduced illness frequency

Most Useful Review

509 people found this helpful

This vitamin is essential for everyone, particularly for bolstering my immune system. I used to get sick frequently, especially from public transport. Since my daughter and I started taking vitamin D-3 regularly, we've both noticed a significant reduction in the common cold.

Updated: Mar 2026

Hashimoto details

Vitamin D3 shows limited effect

Based on 16 Researches

Chahardoli R, Robat-Jazi B, Azizi F, Amouzegar A, Khalili D, et al. Alterations in CD4 T Cell Cytokines Profile in Female Patients with Hashimoto's Thyroiditis Following Vitamin D Supplementation: A Double-blind, Randomized Clinical Trial. Endocr Metab Immune Disord Drug Targets. 2024;24:1454. doi:10.2174/0118715303273297231226153751

We conducted a double-blind, randomized clinical trial to investigate how vitamin D3 supplementation affects Hashimoto's thyroiditis (HT) in female patients. Over three months, participants received either 50,000 IU of vitamin D3 or a placebo. Our focus was on measuring changes in serum cytokine levels and gene expression in CD4+ T cells, which play a critical role in the immune response associated with autoimmune diseases like HT.

Following vitamin D3 supplementation, we observed a significant increase in serum levels of 25-hydroxyvitamin D, while serum calcium levels also rose compared to where they started. However, when checking for changes related to immune response, we noted that supplementation led to a decrease in interleukin-17 (IL-17) levels, but this change didn't differ significantly from those in the placebo group.

On the other hand, the transforming growth factor-beta (TGFβ) gene expression rose significantly with vitamin D3 treatment, yet once again, we didn't see a noticeable difference between the two groups. Importantly, there was no marked effect on other key immune markers, such as interferon-gamma and IL-4 levels. Although we did see some increase in T-bet and GATA3 transcription factors, the overall impact of vitamin D3 on Hashimoto's thyroiditis in our study suggests limited benefits.

This trial sheds light on the complex relationship between vitamin D supplementation and autoimmune conditions like Hashimoto's thyroiditis. While vitamin D3 shows some promise, further long-term studies are essential to truly understand its role and effectiveness in managing HT.

Boosted immune system

Most Useful Review

I adore Vitamin D3 and have felt excellent taking it for four years. I recommend it to friends. Managing my Hashimoto's requires maintaining my TSH levels, and I've found that supporting my immune system with this vitamin is crucial alongside my thyroid hormone therapy.

Updated: Mar 2026

Heartburn details

15 people found this helpful

It’s convenient to select the dosage and number of capsules on the website. This company offers the largest selection of vitamin D3. The capsules are small and easy to swallow, with no heartburn or unpleasant aftertaste. I highly recommend buying them.

Hypothyroidism details

Vitamin D improves thyroid function

Based on 17 Researches

Tang J, Shan S, Li F, Yun P. Effects of vitamin D supplementation on autoantibodies and thyroid function in patients with Hashimoto's thyroiditis: A systematic review and meta-analysis. Medicine (Baltimore). 2023;102:e36759. doi:10.1097/MD.0000000000036759

We conducted a thorough exploration of how vitamin D supplementation can affect hypothyroidism, particularly in patients with Hashimoto's thyroiditis (HT). Our findings draw from a meta-analysis of twelve randomized controlled trials, involving a total of 862 participants. These studies compared the effects of vitamin D against placebo or no treatment, focusing on various thyroid function indicators and autoantibodies.

The results were promising. We found that vitamin D supplementation significantly reduced the levels of anti-thyroid antibodies, specifically thyroid peroxidase antibodies (TPO-Ab) and thyroglobulin antibodies (TG-Ab). Additionally, it appeared to enhance thyroid function by lowering thyroid-stimulating hormone (TSH) levels and increasing free triiodothyronine (FT3) and free thyroxine (FT4) levels.

Notably, we observed that active forms of vitamin D, like calcitriol, were more effective in reducing TPO-Ab compared to the more common D2 and D3 forms. We also noted that longer treatment durations, particularly those exceeding 12 weeks, led to greater improvements in thyroid hormone levels and antibody reductions.

Overall, our study suggests that vitamin D may play a beneficial role in managing Hashimoto’s thyroiditis, potentially helping to modulate immune responses and improve thyroid function.

Deficiency compensation

Most Useful Review

The medication effectively compensated for my vitamin D deficiency, helping me manage my hypothyroidism. I plan to continue taking it regularly.

Updated: Apr 2026

Influenza details

Vitamin D3 may reduce influenza severity

Based on 20 Researches

Hayashi H, Okamatsu M, Ogasawara H, Tsugawa N, Isoda N, et al. Oral Supplementation of the Vitamin D Metabolite 25(OH)D Against Influenza Virus Infection in Mice. Nutrients. 2020;12. doi:10.3390/nu12072000

We aimed to understand how oral supplementation of 25-hydroxyvitamin D, a key metabolite of vitamin D3, influences influenza A virus infection in mice. In our study, mice were given a diet enriched with a high dose of 25(OH)D before they were exposed to the influenza virus.

The results were promising. Mice that received the vitamin D3 supplement showed significantly lower viral levels in their lungs compared to mice that were fed a standard diet. Furthermore, we noticed a decrease in certain pro-inflammatory cytokines, namely IL-5 and IFN-γ, which are involved in the body's inflammatory response to infection. Importantly, we found that the anti-inflammatory cytokines did not see a significant increase.

These findings suggest that 25(OH)D can help to suppress excessive inflammatory responses and may reduce both the replication of the virus and the overall severity of influenza in this mouse model. It opens the door to further exploration on vitamin D3's role in combating influenza in humans.

Improves immunity

Most Useful Review

2 people found this helpful

Vitamin D3 is essential for everyone. I recommend this manufacturer to my friends. It's particularly important for office workers living in areas with limited sunlight. It enhances immunity, supports bone health, and lowers the risk of ARVI and influenza. My family takes it for prevention with 2,000 IU every other day, and daily when ill.

Updated: Mar 2026

Pneumonia details

82 people found this helpful

After being diagnosed with pneumonia, my doctor advised taking this vitamin. I experienced an immediate uplift in my quality of life, my mood improved, and I felt it enhanced my immunity and overall health.

Prostate Cancer details

Vitamin D may reduce prostate cancer mortality

Vaselkiv JB, Shui IM, Grob ST, Ericsson CI, Giovannucci I, et al. Intratumoral vitamin D signaling and lethal prostate cancer. Carcinogenesis. 2024;45:735. doi:10.1093/carcin/bgae055

We set out to understand how vitamin D signaling within prostate cancer tumors might impact patient outcomes, particularly the risk of developing lethal forms of the disease. In our exploration, we analyzed data from 404 men with primary prostate cancer over a long follow-up period, assessing specific gene expressions linked to vitamin D in their tumor tissues.

Our findings revealed a noteworthy trend: the activation of vitamin D signaling in tumors was associated with a lower chance of progressing to lethal prostate cancer. Specifically, men with higher scores indicating active vitamin D signaling had a significantly reduced risk of metastasis or prostate cancer-related death compared to those with lower scores.

Interestingly, this protective association appeared to be stronger in individuals with predicted higher levels of vitamin D in their blood and those who had a body mass index of 25 or higher. With our research providing a clearer picture of how vitamin D functions within tumors, we believe there’s a solid basis for considering vitamin D interventions as potential strategies to enhance survival outcomes for prostate cancer patients.

7.5

Increased energy

Most Useful Review

97 people found this helpful

I've been taking this vitamin since my prostate cancer diagnosis on my doctor's recommendation. After nearly 3 months, I've noticed an increase in energy and mood, along with a significant decrease in fatigue. The overall quality of life is still being assessed, but there has been a notable improvement thus far.

Updated: Mar 2026

Psoriasis details

Vitamin D3 ethosomal gel for psoriasis

Based on 13 Researches

Mehmood Y, Shahid H, Ahmed S, Khursheed A, Jamshaid T, et al. Synthesis of vitamin D3 loaded ethosomes gel to cure chronic immune-mediated inflammatory skin disease: physical characterization, in vitro and ex vivo studies. Sci Rep. 2024;14:23866. doi:10.1038/s41598-024-72951-6

We explored the development of ethosomal gels infused with vitamin D3 to target psoriasis, a chronic skin condition driven by immune responses. Vitamin D3 has long been recognized for its vital role in skin health, particularly in promoting the growth and maturation of skin cells known as keratinocytes.

Our research focused on creating a formulation that combines vitamin D3 with soya lecithin, propylene glycol, and ethanol. Through a series of tests, we assessed the size, shape, and encapsulation efficiency of the ethosomes, finding an impressive encapsulation rate of 96.25%.

The optimized ethosomes measured between 148 and 657 nanometers, with a manageable level of aggregation. We confirmed the formulation's safety and stability over six months, making it suitable for patient use. Additionally, our study demonstrated that this delivery system enabled effective permeation of the drug through membrane barriers.

As we delved into the physical characteristics and effectiveness of these gels, we observed that they could provide a novel and practical option for psoriasis sufferers seeking topical treatments.

Reduced psoriasis impact

Most Useful Review

1 people found this helpful

I prefer NOW brand vitamins for my family. Vitamin D3 is essential. My brother benefited greatly from it for his psoriasis, which has improved significantly. I take it regularly, and it's advisable to test for the right dosage, as deficiency is common.

Updated: Mar 2026

Ulcer details

Vitamin D3 improves ulcer healing

Based on 21 Researches

Halschou-Jensen PM, Sauer J, Bouchelouche P, Fabrin J, Brorson S, et al. Improved Healing of Diabetic Foot Ulcers After High-dose Vitamin D: A Randomized Double-blinded Clinical Trial. Int J Low Extrem Wounds. 2023;22:466. doi:10.1177/15347346211020268

We set out to explore how different doses of vitamin D3, specifically Cholecalciferol, impact the healing of chronic diabetic foot ulcers. Our study included patients with diabetes who had one or more foot ulcers present for longer than six weeks. We assigned participants at random to receive either a high dose of 170 micrograms or a low dose of 20 micrograms daily. Throughout the experiment, both patients and assessors were kept unaware of who was receiving which treatment to ensure unbiased results.

Over our 48-week follow-up period, we observed that the high-dose vitamin D3 treatment yielded significantly better healing outcomes. Among the patients receiving the high dose, 70% of their ulcers healed, while only 35% of those on the low dose showed healing. The median ulcer reduction in the high-dose group was impressive, showing complete healing in many cases, while those on the low dose saw a more modest reduction.

In conclusion, our findings suggest that high-dose vitamin D3 can play a crucial role in promoting the healing of chronic diabetic foot ulcers. By effectively boosting healing rates, this treatment could provide an important avenue for improving health outcomes in patients suffering from these persistent wounds.

Leg ulcer relief

Most Useful Review

During the pandemic, I find vitamin D essential. After completing a course of 2000 units, my leg ulcers disappeared, showing its effectiveness.

Updated: Mar 2026

Herpes details

Reduced herpes frequency

4 people found this helpful

For a year and a half, my girlfriend, a cosmetologist, has been taking vitamin D and claims it has helped her forget about colds and improve her mood. Living in a region with limited sunlight, especially in winter, vitamin D serves as our "sun." Although I typically take multivitamins that include vitamin D, I decided to try it on its own. I combine it with vitamins B and Aevit, and after three weeks, I've noticed slight improvement. Most importantly, I've experienced fewer outbreaks of herpes, which is promising, yet I plan to continue for at least a month to see more effects.

Enhances reproductive function

Low Libido details

Maintaining a proper level of vitamin D is vital for many aspects, including immunological strength, healthy bones and muscles, preventing depression, and normalising reproductive functions, which encompasses increasing libido and rectifying erectile dysfunction. It also plays a role in heart health and enhances skin condition, resolving issues such as hyperpigmentation and dermatitis.

Multiple Sclerosis details

Vitamin D3 alleviates MS symptoms

Robat-Jazi B, Oraei M, Bitarafan S, Mesbah-Namin SA, Noori-Zadeh A, et al. Immunoregulatory Effect of Calcitriol on Experimental Autoimmune Encephalomyelitis (EAE) Mice. Iran J Allergy Asthma Immunol. 2023;22:452. doi:10.18502/ijaai.v22i5.13995

We investigated the influence of calcitriol, the active form of vitamin D, on experimental autoimmune encephalomyelitis (EAE), an animal model akin to multiple sclerosis. Our study involved twenty-eight mice divided into four groups, allowing us to compare outcomes between those with and without EAE, as well as those receiving calcitriol treatment.

We found that, in mice with EAE, inflammation indicators such as interleukin-17 (IL-17) significantly increased, while transforming growth factor beta (TGF-β) levels decreased compared to healthy controls. Upon treating the EAE group with calcitriol, we observed a reversal of these changes, suggesting a substantial immunomodulatory effect, which eased symptoms typically associated with EAE.

Notably, we also noticed that calcitriol enhanced gene expression for interleukin-9 (IL-9) in both healthy and EAE mice. Overall, our findings support the notion that calcitriol holds promise as a potential treatment to alleviate the symptoms of multiple sclerosis through its anti-inflammatory properties.

7.5

Disease prevention

Most Useful Review

Insufficient vitamin D can lead to chronic illnesses like multiple sclerosis and cancer. I take D3 regularly, with higher doses in winter to maintain my health and prevent long-term issues.

Updated: Mar 2026

Stroke details

Vitamin D3 protects neurons from stroke

Based on 26 Researches

Qiao J, Ma H, Chen M, Bai J. Vitamin D alleviates neuronal injury in cerebral ischemia-reperfusion via enhancing the Nrf2/HO-1 antioxidant pathway to counteract NLRP3-mediated pyroptosis. J Neuropathol Exp Neurol. 2023;82:722. doi:10.1093/jnen/nlad047

We explored the potential benefits of vitamin D3 (specifically, 1,25-vitamin D3) for protecting the brain during events such as strokes caused by impaired blood flow, known as cerebral ischemia-reperfusion injury (CIRI). In this study, rats received vitamin D3 supplementation for a week before undergoing a procedure that mimicked a stroke. The results were striking; those treated with vitamin D3 showed significant improvements in neurological function, with reduced areas of brain damage and more surviving neurons.

We also tested the effects of vitamin D3 on rat cortical neurons in a laboratory setting, specifically observing its influence on cell survival during oxygen-glucose deprivation and reoxygenation (a model for stroke). The vitamin D3 treatment not only improved cell viability but also appeared to reduce cell death and inflammation. Our analyses revealed that vitamin D3 boosts important protective proteins in the brain, which help combat oxidative stress and inhibit pathways linked to inflammatory cell death.

Overall, our findings strongly suggest that vitamin D3 could be a valuable resource in stroke management by protecting neurons through its antioxidant actions and reduction of harmful inflammation.

7.5

Stroke post-care

Most Useful Review

Excellent! I was prescribed this product after my stroke to take 2000 IU daily. It contains olive oil, which is crucial for Vitamin D3, and it's reasonably priced with good quality.

Updated: Mar 2026

Tonsillitis details

Vitamin D may reduce tonsillitis

Based on 9 Researches

Al-Rawashdeh BM, Altawil M, Khdair Ahmad F, Alharazneh A, Hamdan L, et al. Vitamin D Levels in Children with Recurrent Acute Tonsillitis in Jordan: A Case-Control Study. Int J Environ Res Public Health. 2022;19. doi:10.3390/ijerph19148744

We aimed to understand the link between vitamin D deficiency and recurrent acute tonsillitis in children. In our study, we gathered data from 242 children suffering from repeated bouts of tonsillitis and compared it with a control group of 262 healthy children.

Our findings revealed that the average vitamin D levels were significantly lower in those with recurrent tonsillitis. Through detailed statistical analysis, we discovered that as vitamin D levels increased, the number of tonsillitis episodes decreased. Specifically, for every increase of one unit in vitamin D, we saw a 3.1% reduction in occurrences of tonsillitis each year.

These results strongly suggest that vitamin D deficiency may contribute to more frequent episodes of tonsillitis in children. To further enhance our understanding, we recommend future trials to explore the potential benefits of vitamin D supplementation for those frequently affected by this condition.

Stopped infections

Most Useful Review

4 people found this helpful

This Vitamin works! My child, aged 10, takes it daily as a prophylactic. Since starting vitamin D3, I have stopped getting sick, particularly with recurrent tonsillitis. I am very pleased with the results!

Updated: Apr 2026

Uterine Fibroids details

Vitamin D may reduce fibroid risk

Based on 16 Researches

Guo W, Dai M, Zhong Z, Zhu S, Gong G, et al. The association between vitamin D and uterine fibroids: A mendelian randomization study. Front Genet. 2022;13:1013192. doi:10.3389/fgene.2022.1013192

We investigated whether higher levels of vitamin D could lower the risk of uterine fibroids, which are common benign tumors affecting women’s health. Using a robust two-sample Mendelian Randomization approach, we analyzed data from over 441,000 individuals.

Our findings suggest a significant link: elevated vitamin D levels appear to correlate with a reduced risk of developing fibroids. This could present new opportunities for clinical treatment. However, further exploration is essential to confirm these promising results.

Vitamin D benefits

Most Useful Review

For adults, for prevention - 1 pc. daily. Normal vitamin D levels protect against colorectal cancer, depression, and rickets. Levels of 75-100 nmol/l (30-40 ng/ml) increase immunity and dental health. Vitamin D3 reduces the risk of pancreatic cancer and regulates calcium-phosphorus metabolism, influencing growth, bone density, and tissue formation. In women, it regulates the cycle, as deficiency is linked to PCOS, endometriosis, uterine fibroids, and cysts.

Updated: Mar 2026

Adrenal Gland Disorder details

Stress relief achieved

I ordered this supplement to combat stress and fatigue, as stress depletes the adrenal glands, leading to irritability and exhaustion. After just a week, I feel lighter, with reduced anxiety and renewed energy. These small capsules are easy to take and have made a notable difference in my life.

Benign Tumor details

Vitamin D3 shows promise for warts

Based on 4 Researches

Mitsuhashi Y. [New aspects on vitamin D3 ointment; treatment of senile warts with topical application of active forms of vitamin D3]. Clin Calcium. 2004;14:141.

We explored the effects of topical vitamin D3 ointment on senile warts, a common benign tumor in the elderly. Over three months, we applied active vitamin D3 forms to 116 patients with these warts.

The results were promising; 30.2% of our cases showed excellent improvement, with tumor sizes reduced by over 80%. Meanwhile, 46.6% saw moderate reductions of between 40% and 80%.

Importantly, we observed no significant side effects, making this a safe alternative treatment option for those affected by senile warts.

Crucial for hormone balance

Most Useful Review

No vitamin enhances health or well-being like vitamin D. No organ in the endocrine system can function properly without adequate vitamin D. Its deficiency is a leading cause of infertility in both men and women. Vitamin D regulates various hormones, particularly testosterone, which influences energy, fat burning, and sexual motivation. It also plays a role in maintaining the body's anti-tumour immunity from birth. Furthermore, lower mortality rates from cardiovascular diseases in summer highlight the importance of vitamin D. Deficiencies in vitamin D and zinc can lead to depression, thus demonstrating its significance for mental health.

Updated: Mar 2026

Bloating details

Likely Very Effective

Vitamin D3 may reduce bloating

Sanaei M, Banasiri M, Shafiee G, Rostami M, Alizad S, et al. Calcium vitamin D3 supplementation in clinical practice: side effect and satisfaction. J Diabetes Metab Disord. 2015;15:9. doi:10.1186/s40200-016-0231-0

We aimed to assess how the supplement OsteoCalVitFort, which includes 500 mg of calcium and 400 I.U. of vitamin D3, affects bloating and overall satisfaction among users. In our study, 186 participants aged between 18 and 65 were invited to take two tablets daily—one after breakfast and one after dinner—over a period defined by the contents of a single pack.

After the supplement use, we discovered that symptoms like bloating and constipation showed a remarkable decline. Specifically, the reported cases of bloating decreased from 12.5% to just 0.6%. Similarly, occurrences of constipation dropped significantly, evidencing that the supplement not only supports bone health but also alleviates some common digestive concerns.

With a fantastic 94% satisfaction rate among users, it seems that OsteoCalVitFort stands out as a favorable option for those looking to enhance their calcium and vitamin D intake without experiencing the side effects often associated with similar supplements. Overall, this study gives us encouraging insights into the positive effects of vitamin D in reducing bloating.

No more bloating

Most Useful Review

I was recommended by a doctor to take vitamin D3, 2000 IU. I previously tried a different D3 vitamin which caused bloating and stomach pain. However, since taking Now Foods' vitamin D3, I feel much better and my digestion is fine. I'm now on my third or fourth bottle and will definitely continue taking it.

Updated: Mar 2026

Breast Cancer details

Vitamin D and breast cancer link

Based on 29 Researches

Schömann-Finck M, Vogt T, Reichrath J. Umbrella Review on the Relationship Between Vitamin D Intake and Cancer. Anticancer Res. 2025;45:855. doi:10.21873/anticanres.17474

We examined the relationship between vitamin D intake and breast cancer, delving into how this vitamin may play a role in prevention and management. The findings suggest that vitamin D may have a protective effect, potentially lowering the risk of developing breast cancer.

While we found a notable connection, it’s important to recognize that most of the existing evidence comes from observational studies. This means we can identify associations but cannot definitively say that vitamin D causes these effects.

Additionally, there are several complexities in studying vitamin D, such as varying metabolism and differences in study designs, which make drawing firm conclusions challenging.

Although the research provides intriguing insights, more rigorous studies are necessary to truly clarify how vitamin D could be integrated into breast cancer care moving forward.

Reduces cancer risk

Most Useful Review

13 people found this helpful

Vitamin D (D3) is key for overall health and may protect against breast cancer and other conditions. I take it daily with food, and I appreciate its small, easy-to-swallow tablets, which have reassured me during these challenging times.

Updated: Apr 2025

Eczema details

Vitamin D reduces eczema severity

Based on 24 Researches

Nielsen AY, Høj S, Thomsen SF, Meteran H. Vitamin D Supplementation for Treating Atopic Dermatitis in Children and Adults: A Systematic Review and Meta-Analysis. Nutrients. 2024;16. doi:10.3390/nu16234128

We focused on understanding the impact of vitamin D supplementation on atopic dermatitis, commonly known as eczema, in both children and adults. This systematic review analyzed data from eleven randomized controlled trials (RCTs), involving a total of 686 participants.

Each study compared participants receiving vitamin D to those in control groups, measuring their eczema severity using established scoring systems. The results were compelling. We found that vitamin D supplementation led to a noteworthy reduction in eczema severity compared to those who did not receive this treatment.

Specifically, the analysis indicated a standardized mean difference of -0.41, suggesting significant benefits for individuals taking vitamin D. However, it’s essential to note that while the findings are promising, larger and longer-term studies are necessary to confirm these results.

Eczema improvement

Most Useful Review

1 people found this helpful

A fantastic supplement that everyone needs. I order it for my 11-year-old daughter, and it's been effective; her eczema on her hands has disappeared.

Updated: Mar 2026

Hypertension details

Calcitriol reduces age-related hypertension

Based on 6 Researches

Hua R, Liu B, He W, Zhang H, Liu Y, et al. Calcitriol reverses age-related hypertension via downregulating renal AP1/ATR pathway through regulating mitochondrial function. Clin Exp Hypertens. 2023;45:2277653. doi:10.1080/10641963.2023.2277653

We explored the role of calcitriol, the active form of vitamin D, in addressing age-related hypertension. The study involved young and aged male mice, where we administered calcitriol daily for eight weeks. Our goal was to determine if this vitamin could effectively lower high blood pressure that often comes with aging.

Throughout the research, we measured blood pressure and examined various biological markers in the kidneys. What we discovered was quite promising. Aged mice exhibited increased blood pressure and impaired sodium excretion, both linked to changes in certain kidney pathways. After treatment with calcitriol, these mice showed significant reductions in blood pressure and improvements in sodium handling.

Mechanistically, calcitriol appeared to enhance mitochondrial function and alter the behavior of specific proteins related to blood pressure regulation. By promoting healthier kidney function and reducing harmful signaling pathways, calcitriol seems to offer a viable strategy for tackling hypertension as we age.

Overall, our findings suggest that calcitriol could be a valuable addition to our approaches in managing age-related hypertension, reaffirming the importance of vitamin D for our health as we get older.

Vital for hypertension

Most Useful Review

13 people found this helpful

Good composition of lanolin. Vitamin D (D3) is vital for health, possibly preventing serious ailments. Studies show that optimal vitamin D levels can lower the risk of heart attacks and hypertension. I took 2000 units during the pandemic with food.

Updated: Apr 2025

Insomnia details

Vitamin D benefits for insomnia

Based on 5 Researches

Sharifan P, Khoshakhlagh M, Khorasanchi Z, Darroudi S, Rezaie M, et al. Efficacy of low-fat milk and yogurt fortified with encapsulated vitamin D on improvement in symptoms of insomnia and quality of life: Evidence from the SUVINA trial. Food Sci Nutr. 2020;8:4484. doi:10.1002/fsn3.1750

We set out to explore the relationship between vitamin D and insomnia by examining how low-fat milk and yogurt fortified with 1,500 IU of nano-encapsulated vitamin D could improve sleep issues and overall quality of life.

In our analysis, we included adults with abdominal obesity and a history of insomnia, identifying twenty-nine participants through insomnia severity questionnaires. They were split into four groups: one receiving fortified low-fat milk, another with unfortified milk, a third group consuming fortified yogurt, and a fourth with unfortified yogurt. Over a ten-week period, we tracked changes in insomnia symptoms and quality of life.

Our findings revealed that those drinking the vitamin D fortified milk experienced significant improvements in insomnia scores compared to those consuming regular milk. Additionally, quality of life assessments showed positive changes for both fortified and unfortified milk groups. However, the yogurt groups did not demonstrate significant benefits, indicating that while fortified dairy has potential, yogurt may not be as effective in this context.

In conclusion, incorporating fortified low-fat milk into our diets could help ease insomnia symptoms and enhance life satisfaction, although yogurt did not show the same promise.

Improved mood

Most Useful Review

430 people found this helpful

I decided to take vitamin D due to its positive effects on my body and my love for the sun. I often feel sluggish and down during autumn, and I've noticed significant improvements after taking these vitamins. I chose a dosage of 2000 IU, as I hardly go outside and suffer from poor mood in colder months. Taking one small capsule in the morning has really helped lift my spirits and combat insomnia.

Updated: Mar 2026

Leg Cramps details

Very Likely Ineffective

Minimal effects of vitamin D

Luo L, Zhou K, Zhang J, Xu L, Yin W. Interventions for leg cramps in pregnancy. Cochrane Database Syst Rev. 2020;12:CD010655. doi:10.1002/14651858.CD010655.pub3

We assessed the impact of vitamin D on leg cramps experienced during pregnancy, referring to data from various studies. One of the key findings was that vitamin D treatment showed little to no difference when it came to reducing the frequency of leg cramps.

In a trial involving 84 women, participants who received vitamin D did not see significant changes in the frequency of leg cramps after three weeks or six weeks post-treatment. This suggests that, while vitamin D is often discussed in the context of health benefits, its effectiveness for leg cramps specifically might be quite limited.

Overall, the evidence we reviewed highlights the need for caution. The findings suggest that vitamin D may not be a viable treatment option for managing leg cramps during pregnancy, indicating a need for more robust research in this area.

Reduced sweet cravings

Most Useful Review

3 people found this helpful

I’ve struggled with cravings for sweets, particularly pies. After starting D3, I noticed a decrease in these cravings over time. My vitamin D levels rose from 16 to 28 after four months of taking D3 and selenium during the autumn-winter period, which has truly worked wonders for me, including reducing leg cramps.

Updated: Mar 2026

Obesity details

Vitamin D reduces triglycerides effectively

Based on 12 Researches

Hu L, Velu P, Prabahar K, Hernández-Wolters B, Kord-Varkaneh H, et al. Effect of Vitamin D Supplementation on Lipid Profile in Overweight or Obese Women: A Meta-analysis and Systematic Review of Randomized Controlled Trials. Nutr Rev. 2025. doi:10.1093/nutrit/nuae226

We explored the effects of vitamin D supplementation on lipid profiles in overweight and obese women. Our investigation included data from various randomized controlled trials (RCTs) that specifically examined how vitamin D might influence cholesterol and triglyceride levels in this population.

Our analysis revealed that vitamin D had a significant impact on lowering triglycerides and total cholesterol levels. We found reductions of about 6.13 mg/dL for triglycerides and 4.45 mg/dL for total cholesterol. Additionally, there was a noteworthy increase in HDL cholesterol, the “good” cholesterol, by an average of 1.54 mg/dL.

Interestingly, we noticed that those with higher baseline triglyceride levels saw even greater benefits, particularly with a significant reduction in triglycerides when vitamin D was supplemented for 26 weeks or less. However, it’s important to mention that vitamin D supplementation did not have a significant effect on LDL cholesterol levels in this group.

Overall, our findings suggest that vitamin D can be an effective option for managing certain aspects of lipid profiles in overweight or obese women, particularly in addressing high triglycerides.

7.5

Increased dosages recommended

Most Useful Review

Should tests reveal low vitamin D levels, a daily intake of 1500 - 2000 IU is advisable. For those with a BMI over 30, increasing the dosage to 6000 - 8000 IU may be beneficial in addressing obesity-related issues.

Updated: Mar 2026

Tuberculosis details

Vitamin D improves EPTB treatment outcomes

Based on 12 Researches

Eletreby R, Elsharkawy A, Mohamed R, Hamed M, Kamal Ibrahim E, et al. Prevalence of vitamin D deficiency and the effect of vitamin D3 supplementation on response to anti-tuberculosis therapy in patients with extrapulmonary tuberculosis. BMC Infect Dis. 2024;24:681. doi:10.1186/s12879-024-09367-0

We assessed vitamin D levels in patients with extrapulmonary tuberculosis (EPTB) and evaluated the effects of vitamin D3 supplementation on their treatment.

In our study, 47 EPTB patients received vitamin D3 or standard anti-TB treatment alone. We found that vitamin D levels were much lower in EPTB patients compared to healthy controls.

Those receiving vitamin D3 showed improvements, such as better weight gain, higher albumin and hemoglobin levels, and reduced inflammation markers, suggesting that vitamin D supplementation can enhance anti-TB therapy.

Antidepressant effects

Most Useful Review

These vitamins are well absorbed and enhance immunity, improving calcium and phosphorus metabolism. They serve as excellent antidepressants and possess both anti-tuberculosis and antifungal effects. Our entire family has benefited from these during the off-season, with a practical preventive dosage.

Updated: Mar 2026

Acne details

Vitamin D's effect on acne

Based on 24 Researches

Hasamoh Y, Thadanipon K, Juntongjin P. Association between Vitamin D Level and Acne, and Correlation with Disease Severity: A Meta-Analysis. Dermatology. 2022;238:404. doi:10.1159/000517514

We examined how vitamin D levels relate to acne and the potential connection with acne severity. By analyzing data from various studies, we found that 1,362 individuals with acne were compared against 1,081 healthy controls.

Our findings revealed that those with acne had significantly lower vitamin D levels compared to the healthy participants. Additionally, vitamin D deficiency was more prevalent among acne sufferers. Interestingly, we also observed a negative correlation between vitamin D levels and acne severity, suggesting that lower levels of this vitamin might be associated with more severe acne.

This evidence points to the possibility that vitamin D plays a role in acne development. However, while our results are compelling, they encourage further investigation into how vitamin D might influence acne severity and whether its supplementation could be beneficial for those affected by this condition.

Skin becomes clearer

Most Useful Review

104 people found this helpful

The skin became softer, without peeling, and my pimples disappeared. I do not stop taking vitamin D as it is vital for my chronic conditions and living in the Urals. I found that I prefer lower dosages during spring and autumn and a higher dose in winter. I recommend it to everyone.

Updated: Apr 2026

Blurred Vision details

Vision improvement confirmed

Good quality vitamin D3 with beneficial ingredients. I’ve noticed eye benefits and improvement in my vision, and it tastes good too.

Chronic Fatigue Syndrome details

Vitamin D3 ineffective for CFS relief

Based on 4 Researches

Witham MD, Adams F, McSwiggan S, Kennedy G, Kabir G, et al. Effect of intermittent vitamin D3 on vascular function and symptoms in chronic fatigue syndrome--a randomised controlled trial. Nutr Metab Cardiovasc Dis. 2015;25:287. doi:10.1016/j.numecd.2014.10.007

We conducted a study to see if high-dose vitamin D3 could improve vascular health and reduce fatigue in individuals suffering from chronic fatigue syndrome (CFS). This was a well-structured trial involving 50 participants, all of whom met specific diagnostic criteria for CFS. Participants were divided into two groups: one received 100,000 units of vitamin D3 every two months, while the other received a placebo over a period of six months.

Despite a noticeable increase of 22 nmol/L in vitamin D levels for those who received the treatment compared to the placebo group, we found no significant benefits. There was no change in arterial stiffness, a key vascular health indicator, nor improvements in overall fatigue as measured by the Piper Fatigue scale.

In essence, our findings indicate that high-dose oral vitamin D3 does not offer the hoped-for relief in vascular function or fatigue for patients with chronic fatigue syndrome. This suggests that other therapeutic options may need to be explored for individuals suffering from this condition.

7.5

Enhanced well-being

Most Useful Review

92 people found this helpful

Marvellous! After years of struggling with chronic fatigue syndrome, this vitamin, recommended by my doctor, has noticeably improved my wellbeing, mood, and immune system in just a few weeks.

Updated: Mar 2026

Cold Sores details

Genetic factors in cold sores

Santamaria P, Bowyer RCE, Nibali L. Associations between host genetic variants and Herpes Simplex Labialis in the TwinsUK cohort. Arch Oral Biol. 2023;145:105587. doi:10.1016/j.archoralbio.2022.105587

We explored how a specific genetic variant associated with vitamin D might influence the occurrence of cold sores, also known as Herpes Simplex Labialis (HSL). Our research involved nearly 1,800 participants from the TwinsUK registry, with a focus on a group of 595 that completed both blood tests and questionnaires regarding their cold sore experiences.

From the participants surveyed, 235 reported having experienced cold sores at least once, and out of these, 160 indicated that they had recurrent episodes. While we investigated several genetic variants, including three commonly discussed in relation to cold sores, we found no significant links between these particular SNPs and the occurrence or recurrence of cold sores.

However, our analysis did reveal a noteworthy association with a genetic variation in the Vitamin D Receptor (VDR) gene. This variant was significantly correlated with both the history of cold sore outbreaks and their frequency. While this suggests a potential relationship between vitamin D-related genetics and cold sore experiences, it does not mean that vitamin D treatment has a proven direct effect on reducing these occurrences.

Overall, our findings provide an intriguing glimpse into the genetic factors that may play a role in cold sore reactivation, especially as it pertains to the VDR gene. Yet, since we didn't explore the direct effects of vitamin D supplementation, more research would be needed to conclusively determine how vitamin D treatment might influence cold sore frequency.

Effective detox

Most Useful Review

15 people found this helpful

I take 2000 IU of vitamin D for health and detox. I prefer supplements since I avoid sunbathing. Since I began taking this, I haven't been catching colds, and I'm feeling much better overall.

Updated: Apr 2025

Hives details

Vitamin D may alleviate chronic hives

Based on 19 Researches

Yuan I, Katari P, Shaker M. Vitamin D treatment for chronic urticaria: a case report. J Med Case Rep. 2019;13:193. doi:10.1186/s13256-019-2121-9

We explored the intriguing connection between vitamin D and chronic hives, also known as chronic urticaria. This condition involves recurring itchy welts that can be quite frustrating, especially when the triggers are often elusive. In this case, we observed a 14-year-old boy suffering from persistent hives that weren’t responding to conventional treatments. Thankfully, during his medical evaluation, we discovered he had a vitamin D deficiency.

The boy underwent high-dose vitamin D replenishment, which led to a remarkable and swift improvement in his symptoms. This incident raises an important question about the potential role of vitamin D in both the development and treatment of chronic urticaria. While there’s some evidence suggesting a linked relationship, measuring vitamin D levels and providing supplementation aren’t standard practices in diagnosing or treating this condition yet.

Although our findings indicate that vitamin D might help some patients, we remain cautious about recommending routine screening for vitamin D deficiency in those with chronic urticaria. More research is needed to determine how cost-effective such screenings would be for this condition. Overall, this case sheds light on the possibility that vitamin D could play a significant role in managing chronic hives for certain individuals.

Chronic hives relief

Most Useful Review

This excellent product helped me eliminate chronic hives that were unresponsive to other medications.

Updated: Mar 2026

Mild Cognitive Impairment details

Comprehensive benefits

1 people found this helpful

Taking Vitamin D3 is paramount as it aids in bone development and absorption of key minerals like phosphorus and calcium. It's suitable for vegetarians and contributes to skin health, metabolic improvements, and immune support. Regular intake is essential to prevent osteoporosis and rickets. It also normalises hormone production and could aid in preventing cancer and dementia.

Alzheimer details

Vitamin D may aid Alzheimer treatment

Based on 19 Researches

Kang J, Park M, Kim T. Vitamin D Reduces GABA-Positive Astrocytes in the 5xFAD Mouse Model of Alzheimer's Disease. J Alzheimers Dis. 2024;97:1939. doi:10.3233/JAD-231033

We aimed to understand how vitamin D influences the progression of Alzheimer’s disease (AD) by examining its effects on the brain. Our study involved male 5xFAD mice that underwent various dietary regimes and received vitamin D injections. This allowed us to investigate both vitamin D deficiency and supplementation in relation to AD symptoms.

Through careful analysis of brain tissue, we looked for changes in amyloid-β (Aβ) plaques and the presence of reactive astrocytes—important cells that interact with neurons in the brain. Our findings demonstrated a noteworthy association between vitamin D levels and reductions in harmful Aβ pathways and reactive astrogliosis.

This is significant since it suggests that maintaining adequate vitamin D levels might be a promising strategy for preventing or treating Alzheimer’s disease. Overall, our study provides crucial insights into how vitamin D could potentially alter the course of AD, opening the door for new therapeutic approaches.

Supports cognitive health

Most Useful Review

Vitamin D is essential from birth, yet its importance is often overlooked. I ordered D3 capsules for both my husband and myself. This vitamin supports various bodily functions, including immunity and cognitive health, which is vital for conditions like Alzheimer’s. However, there is no childproof cap on the product, which is concerning. Overall, its benefits for mood regulation and cognitive function are worth noting.

Updated: Apr 2025

Headache details

Vitamin D3 aids migraine relief

Ghorbani Z, Togha M, Rafiee P, Ahmadi ZS, Rasekh Magham R, et al. Vitamin D3 might improve headache characteristics and protect against inflammation in migraine: a randomized clinical trial. Neurol Sci. 2020;41:1183. doi:10.1007/s10072-019-04220-8

We conducted a rigorous study to explore how vitamin D3 supplementation might influence headaches in people suffering from migraines. By utilizing a well-structured, placebo-controlled, double-blind design, we included 80 participants with episodic migraines, assigning them either a daily dose of vitamin D3 or a placebo for 12 weeks.

After the study, we observed significant improvements in those receiving vitamin D3. Participants reported fewer headache days each month, shorter headache durations, and less severe pain overall. They also used fewer pain relievers compared to those on placebo, showcasing the potential benefit of vitamin D3 in managing migraine symptoms.

Our findings suggest that vitamin D3 not only aids in reducing headache frequency but may also play a role in addressing inflammation, as evidenced by reduced levels of certain inflammatory markers in the blood. This highlights its possible therapeutic value for migraine sufferers, indicating that a daily dose could make a meaningful difference in their lives.

Noticed improvements

Most Useful Review

353 people found this helpful

Good day! I would like to share my experience with vitamin D-3. As a young mother, my health felt like a "squeezed lemon" even two years post-birth. I was always fatigued, lethargic, prone to colds, and suffered from headaches. I decided to take it for preventive health and to boost my energy. Initially, after a month of use, I saw no change, but by the second month, I realised I hadn’t caught a cold in ages. While mornings remain tough, my skin is fresher and gastrointestinal health has improved. Given the lack of sunlight in the Middle Urals during winter, I’ve chosen to continue taking vitamin D until summer. I’m very pleased with the changes I've noticed.

Updated: Apr 2026

Liver Disease details

Vitamin D improves liver health

Derogar Kasmaei SR, Parastouei K, Hosseini Ahangar B, Saberifiroozi M, Taghdir M. Effects of vitamin D supplementation on the glycaemic indices, lipid profile and liver function tests in patients with cirrhosis: a double-blind randomised controlled trial. BMJ Nutr Prev Health. 2024;7:e000938. doi:10.1136/bmjnph-2024-000938

We explored the effects of vitamin D supplementation in patients with liver cirrhosis—a progressive disease that often manifests alongside vitamin D deficiency. In a carefully designed study, we involved sixty patients who participated in a double-blind, randomized controlled trial. Each patient received either a weekly dose of 50,000 IU of vitamin D or a placebo over 12 weeks.

Throughout the study, we assessed key health markers before and after supplementation, including liver function tests, lipid profiles, and glycaemic indices such as fasting blood glucose and insulin resistance. By the end of the trial, our findings indicated that vitamin D supplementation significantly improved fasting blood glucose levels and insulin resistance in the participants.

Specifically, we observed noteworthy increases in serum 25-hydroxy-vitamin D levels and reductions in fasting blood glucose and insulin resistance indicators. These results suggest that vitamin D might be an important player in improving metabolic health for those suffering from liver cirrhosis.

7.5

Vitamin D3 efficacy

Most Useful Review

278 people found this helpful

I take vitamin D3 regularly due to my minimal sun exposure. This supplement aids my immunity, especially in winter. I consume 2000 IU off-season and 5000 IU in winter—perfect for my routine! Since starting, I’ve noticed fewer illnesses, which I attribute to the vitamin D3. I recommend it for better health overall.

Updated: Mar 2026

Autoimmune Disorder details

Vitamin D3 modulates autoimmune response

Based on 25 Researches

Zhang Q, He X, Chen W, Jiu J, Gao C, et al. Vitamin D3 attenuates autoimmune thyroiditis by regulating Th17/Treg cell differentiation via YAP/JAK1/STAT1 axis. Immunol Lett. 2024;269:106890. doi:10.1016/j.imlet.2024.106890

We explored how Vitamin D3 impacts autoimmune thyroiditis, a specific autoimmune disorder. In this study, researchers established a mouse model of experimental autoimmune thyroiditis (EAT) to see how Vitamin D3 could influence this condition. After eight weeks of treatment, they assessed thyroid health and immune response through various methods, including staining tissues and measuring hormone levels.

Our observations revealed that administering Vitamin D3 helped reduce damage to the thyroid and decreased the presence of inflammatory cells within the thyroid. This treatment also led to lower levels of thyroid hormones and autoimmune antibodies in the blood, highlighting its positive effect on thyroid function. Additionally, Vitamin D3 appeared to promote the regulatory T cell (Treg) subset while decreasing the levels of Th17 cells, which are often involved in autoimmune processes.

Mechanistically, the study found that Vitamin D3 triggered specific pathways that influence Treg cell activity and survival. Notably, it activated a signaling pathway involving YAP and JAK/STAT, which are crucial for immune cell regulation. These findings suggest that Vitamin D3 could play a significant role in balancing immune responses in autoimmune thyroiditis, making it a promising candidate for further research and potential treatment strategies.

Improved health

Most Useful Review

5 people found this helpful

This product genuinely works! I noticed improved health and vitality, significantly enhancing my immune system. I rarely get sick now, and waking up has become easier, which is essential, especially considering my hormonal disorders. I recommend checking vitamin levels regularly.

Updated: Mar 2026

Bronchitis details

Vitamin D3 improves immune function

Based on 4 Researches

Babarykin DA, Vasipa SB, Gintere GB, Bigestan VIa. [Immunocorrecting properties and effect on the phosphorus-calcium metabolism of oxidevit (1 alpha-hydroxyvitamin D3)]. Vopr Med Khim. 1988;34:104.

We explored the impact of 1 alpha-hydroxyvitamin D3, commonly known as vitamin D3, on patients with chronic bronchitis, focusing on its potential benefits for the immune system and calcium-phosphorus metabolism. In this study, 45 patients received doses of either 2 or 4 micrograms of the vitamin over a period of 1 to 2 weeks.

Our findings revealed that the treatment led to observable changes in the metabolism of calcium and phosphorus. The alterations depended on the specific dose and duration of the treatment. Notably, the higher dose of 4 micrograms daily over two weeks was identified as excessive.

We also assessed various immune system components, such as total and rosette-forming cells, T-lymphocyte helpers and suppressors, and B lymphocytes. All these immune parameters showed significant normalization, regardless of the patients' initial levels. Elevated values tended to decrease, while those that were low increased back towards normal. It’s essential to note that despite these positive changes, the immune patterns remained stable throughout the treatment period.

Interestingly, we found a correlation between blood inorganic phosphorus levels and the dynamics of leukocytes, suggesting an interaction between immune responses and mineral metabolism. Overall, vitamin D3 treatment demonstrates a noteworthy effect on improving immune system function in chronic bronchitis patients, supporting its role as an adjunct therapy in managing this condition.

Quick recovery

Most Useful Review

5 people found this helpful

This vitamin D has had a positive effect on my well-being: no spring blues or vitamin deficiency, and I caught bronchitis but recovered quickly without antibiotics. Cuts heal faster now, which is wonderful.

Updated: Mar 2026

Endometriosis details

Supports women's health

This Vitamin D3 supplement offers good quality and value. It aids in calcium and phosphorus absorption, essential for my overall health, including the prevention of endometriosis and other reproductive issues. I am particularly cautious to take this vitamin during low sunlight months as it's important for women's health. I feel it has positively impacted my energy and wellbeing, making it a key part of my daily routine.

Updated: Apr 2026

Heart Attack details

Calcitriol aids heart recovery

Based on 22 Researches

Yang S, Wang C, Ruan C, Chen M, Cao R, et al. Novel Insights into the Cardioprotective Effects of Calcitriol in Myocardial Infarction. Cells. 2022;11. doi:10.3390/cells11101676

We examined the impact of calcitriol, the active form of vitamin D, on heart attack recovery using a mouse model of myocardial infarction (MI). In our study, we treated mice that had suffered a MI with calcitriol and observed promising results.

Our findings revealed that calcitriol helped reverse negative effects on heart function and reduced cardiac remodeling after a heart attack. It also targeted the inflammatory response typically associated with MI, improving the survival of heart muscle cells and promoting their regeneration.

We discovered that calcitriol works by enhancing the activity of the Vitamin D receptor (VDR). This process not only interferes with inflammatory signals but also leads to positive changes at the genetic level, further supporting heart health after an MI. Overall, our study provides strong evidence of calcitriol's cardioprotective properties, making it a potential treatment avenue for better outcomes following a heart attack.

7.5

No symptoms reported

Most Useful Review

4 people found this helpful

Easy to take. If it is 5000 IU, an overdose could cause hypercalcemia, leading to calcium deposits in blood vessels, kidneys, and lungs, resulting in renal dysfunction, anorexia, and vomiting. Thankfully, I have experienced none of these symptoms and my heart feels somewhat improved.

Updated: Apr 2025

Premenstrual Syndrome details

Alleviates PMS symptoms

After taking vitamin D3 for a month, my chest pains during menstruation vanished, and it eliminated the symptoms of premenstrual syndrome (PMS).

Sleep Apnea details

Vitamin D3 improves mild sleep apnea

Based on 10 Researches

Ayyıldız F, Yıldıran H, Afandiyeva N, Gülbahar Ö, Köktürk O. The effects of vitamin D supplemantation on prognosis in patients with mild obstructive sleep apnea syndrome. Turk J Med Sci. 2021;51:2524. doi:10.3906/sag-2101-83

We set out to evaluate what effect vitamin D3 supplementation might have on patients suffering from mild obstructive sleep apnea syndrome (OSAS). In this study, 19 adult men who were diagnosed with mild OSAS and had low vitamin D levels participated over an 8-week period. Each week, they took a sizable dose of 50,000 IU of vitamin D3 while undergoing various health assessments. We measured important factors like blood glucose, lipid profiles, and inflammation markers, along with repeated sleep monitoring through polysomnography.

By the end of the study, we observed a significant increase in participants' vitamin D levels, which jumped from an average of 19.5 to 41.8 ng/mL—an indication that the supplementation was effective. Along with this rise in vitamin D, we also noted improvements in fasting blood glucose and total cholesterol levels, as well as a decrease in key inflammation markers. Most encouragingly, the frequency of obstructive apneas and other related sleep disturbances significantly decreased.

Based on these findings, it seems that vitamin D supplementation can play a beneficial role in improving the prognosis for those with mild OSAS. It's exciting to consider how something as simple as a vitamin could lead to better sleep health for individuals struggling with sleep apnea.

Improved sleep quality

Most Useful Review

5 people found this helpful

It effectively addressed my husband's nocturia and my own sleep issues. Previously, I would wake at least twice nightly, feeling exhausted. After taking this vitamin D supplement daily, I noticed immediate improvements in my sleep quality, allowing me to rest through the night. It's considerably cheaper than other products I tried, and I’m grateful for NOW Foods and iHerb.

Updated: Mar 2026

Bone Pain details

Vitamin D3 correction improves pain

Based on 3 Researches

Rajani AM, Mittal A, Kulkarni VU, Rajani KA, Rajani KA. Role of Pre-operative Correction of Vitamin D3 Deficiency in Controlling Post-operative Bone Pain after Unicompartmental Knee Arthroplasty. Malays Orthop J. 2024;18:7. doi:10.5704/MOJ.2411.002

We explored the impact of vitamin D3 levels on bone pain that patients experience after undergoing unicompartmental knee arthroplasty (UKA). The study involved 240 participants who were divided into three groups based on their vitamin D status—some received treatment before surgery, some after, and others had normal levels to begin with.

By administering vitamin D3 in three doses, we aimed to see if correcting deficiencies could alleviate post-operative bone pain. Throughout the recovery period, we measured pain levels using the visual analog scale at various intervals after the surgery.

Our findings clearly demonstrated that patients who corrected their vitamin D3 deficiency before surgery reported significantly better pain control after the operation compared to those who were treated afterwards or those who started with adequate levels. This highlights the importance of testing and addressing vitamin D status prior to orthopedic procedures, showing that it is a modifiable risk factor affecting recovery.

Restored bone health

Most Useful Review

318 people found this helpful

Vitamin D3 effectively strengthened my bones and boosted immunity. I recommend taking it before the cold season to combat bone pain.

Updated: Mar 2026

Indigestion details

I purchased vitamin D capsules from the pharmacy and experienced indigestion. I found it difficult to drink them. Consequently, I ordered NOW vitamin D3 (2000 IU) - the soft capsules are easy to swallow with no issues with my stool. The dosage is fantastic, with just 1 capsule required per day!

Migraine details

Vitamin D helps reduce migraines

Based on 29 Researches

Hu C, Fan Y, Wu S, Zou Y, Qu X. Vitamin D supplementation for the treatment of migraine: A meta-analysis of randomized controlled studies. Am J Emerg Med. 2021;50:784. doi:10.1016/j.ajem.2021.07.062

We explored the potential benefits of vitamin D supplementation for treating migraines. Our analysis focused on several randomized controlled trials (RCTs) to examine how effective vitamin D could be in alleviating migraine symptoms.

Through our review, we included six RCTs involving 301 patients. The results were quite promising. Vitamin D supplementation significantly reduced the number of headache attacks per month and the number of headache days experienced by patients. Additionally, it improved the MIDAS score, which measures the impact of migraines on daily life.

However, it's important to note that vitamin D did not show a significant effect on how long migraine attacks lasted or the severity of the headaches. Overall, our findings suggest that while vitamin D might be beneficial for reducing certain migraine-related symptoms, it isn’t a miracle cure for everyone.

No more migraines

Most Useful Review

Now Foods offers an excellent product. I adore Vitamin D3, especially as I rarely go out, even pre-pandemic. I used to suffer from migraines, but since taking these capsules, I no longer experience headaches or joint pain. My sleep has significantly improved.

Updated: Mar 2026

Asthma details

Vitamin D improves asthma outcomes

Niu H, He H, Zhao Z, Lu X, Zhao G. Asthmatic patients with vitamin D deficiency: Can vitamin D supplementation make a difference. Technol Health Care. 2024;32:3985. doi:10.3233/THC-231462

We're delving into the potential effects of vitamin D on asthma management. The focus of this study is whether vitamin D supplementation can help asthmatic patients reduce their flare-ups and enhance their lung function.

To answer this question, we analyzed several randomized controlled trials that scrutinized the impact of vitamin D on patients with asthma. The findings were promising, as we observed that vitamin D supplementation not only improved lung function, measured through the predicted FEV1 value, but also successfully elevated the levels of serum 25-hydroxyvitamin D in participants.

Overall, this study supports the idea that vitamin D may play a beneficial role in asthma care by potentially reducing the frequency of asthma attacks and improving lung health. It's an exciting area for further research, especially considering the varying results from asthma studies worldwide.

Assisted asthma management

Most Useful Review

I take vitamin D because I have asthma, and I usually take 2000 IU, as opposed to 1000 IU. Vitamin D seems to be beneficial, though I'm still seeking complete satisfaction.

Updated: Mar 2026

Kidney Stones details

Vitamin D's limited effect on kidney stones

Based on 9 Researches

Sardari Masihi L, Borumandnia N, Taheri M, Basiri A, Imani H, et al. Effect of two vitamin D repletion protocols on 24-h urine calcium in patients with recurrent calcium kidney stones and vitamin D deficiency: a randomized clinical trial. Eur J Med Res. 2023;28:246. doi:10.1186/s40001-023-01226-z

We conducted a clinical trial to explore how different vitamin D treatment protocols affect kidney stones in patients who frequently experience them and have low vitamin D levels. We involved 62 participants, all with serum vitamin D levels between 10 to 20 ng/ml, and split them into two groups: one received 2000 IU of oral vitamin D daily for 12 weeks, while the other took 50,000 IU weekly for 8 weeks.

Our results showed that both treatment approaches led to a significant increase in 24-hour urine calcium. However, we observed no notable difference between the two therapies regarding this measure. Importantly, while there was an increase in 24-hour urine calcium, neither treatment affected the supersaturation levels of calcium oxalate or calcium phosphate, which are critical in the formation of kidney stones.

We also noted a significant rise in serum 25-hydroxyvitamin D levels, with the weekly regimen showing a greater increase. Alongside these changes, parathyroid hormone levels decreased in both groups. Ultimately, while vitamin D supplementation did elevate urine calcium levels, it did not enhance supersaturation factors that contribute to kidney stone formation, indicating that the benefits of vitamin D in this context may be limited.

Kidney discomfort

Most Useful Review

1 people found this helpful

This vitamin didn’t suit me; it caused discomfort in my kidneys which went away after I stopped taking it.

Updated: Mar 2026

Osteoporosis details

Vitamin D's impact on osteoporosis

Yang C, Chen L, Guo X, Sun H, Miao D. The Vitamin D-Sirt1/PGC1α Axis Regulates Bone Metabolism and Counteracts Osteoporosis. J Orthop Translat. 2025;50:211. doi:10.1016/j.jot.2024.10.011

We aimed to understand how vitamin D influences bone health and helps combat osteoporosis, a condition that weakens bones. In our study, we used various mouse models, including those that mimic a deficiency in active vitamin D. Through a range of advanced methods, we assessed how changes in vitamin D levels affected bone structure and metabolism.

The research revealed that insufficient vitamin D led to a drop in Sirt1, a gene that plays a crucial role in maintaining bone density. This lack of Sirt1 resulted in increased bone loss. However, when we boosted Sirt1 levels in bone stem cells, we observed a reversal in bone loss. This improvement happened because higher Sirt1 levels reduced oxidative stress, slowed down aging processes in bone cells, and enhanced new bone formation while curbing bone resorption.

Additionally, our findings indicated that vitamin D directly stimulates Sirt1 expression in these stem cells, which is vital for bone health. We also explored the effects of resveratrol, a natural compound known for activating Sirt1, and found it helped alleviate osteoporosis symptoms linked to vitamin D deficiency by enhancing the relationship between Sirt1 and another protein called PGC1α, which supports bone formation and energy metabolism.

This research underscores the importance of the vitamin D-Sirt1/PGC1α axis in bone metabolism, providing insight into how vitamin D can serve as a target for osteoporosis prevention and treatment.

Positive osteoporosis treatment

Most Useful Review

1 people found this helpful

As the most active form, D3 assists in calcium, magnesium, and phosphorus absorption, thereby promoting bone health. It may enhance insulin sensitivity and reduce cancer cell growth. My experience over a year has shown improved treatment results for osteoporosis in my femoral neck, with increased blood levels of 25(OH) D. I recommend taking it with fatty foods for optimal absorption.

Updated: Mar 2026

Autism details

For my 6-year-old son with autism, this Vitamin D3 has been perfect amid deficiency. After just a month, his levels doubled, and he swallows it easily. Our doctor has recommended regular use, and I plan to continue ordering it.

90 people found this helpful

Attention Deficit Hyperactivity Disorder details

My children struggled with taking pills for their ADHD. This vitamin transformed our situation; I can genuinely see their improvement, and it has made me very happy.

Nausea details

Vitamin D and nausea in gastroparesis

Koch KL, Parkman HP, Yates KP, Van Natta ML, Grover M, et al. Low Vitamin D Levels in Patients with Symptoms of Gastroparesis: Relationships with Nausea and Vomiting, Gastric Emptying and Gastric Myoelectrical Activity. Dig Dis Sci. 2024;69:2904. doi:10.1007/s10620-024-08520-8

We delved into an intriguing question: how do low vitamin D levels affect nausea in people experiencing gastroparesis, a condition that slows gastric emptying? By measuring the vitamin D levels of patients from the Gastroparesis Clinical Consortium Registry, we aimed to uncover the relationships between vitamin D, nausea, and gastric function.

Our findings revealed that over half of the patients had low vitamin D levels, specifically 56.1% of the 513 individuals studied. We observed a clear association between these low levels of vitamin D and increased experiences of nausea and vomiting. This was particularly notable in patients with delayed gastric emptying, where those with low vitamin D levels reported significantly more nausea.

While the study showed a correlation, it did not address whether supplementing with vitamin D could directly alleviate these symptoms. Instead, we found that lower vitamin D levels also related to a greater retention of food in the stomach after meals, which hints at a connection to gastric neuromuscular dysfunction. Overall, our study emphasized a noteworthy link between vitamin D and nausea but stopped short of confirming any direct treatment benefits.

7.5

Triggered nausea

Most Useful Review

1 people found this helpful

It suited me well, but my sister experienced sensitivity after three days, possibly due to fish oil or similar ingredients. She had nausea when chewing the capsules. I recommend swallowing them whole to avoid the oily taste.

Updated: Mar 2026

Rash details

Relieves itching effectively

1 people found this helpful

Good way to meet your daily vitamin D intake. Since quarantine, it's been difficult to go out often, and I found my vitamin D levels had dropped, causing some skin issues. I started taking this, and it helps relieve the itch and rashes.

Diarrhea details