Overview

SCIENTIFIC SCORE
Possibly Effective
Based on 27 Researches
7.5
USERS' SCORE
Good
Based on 4 Reviews
8.4
Supplement Facts
Serving Size: 1 Softgel
Amount Per Serving
%DV
Vitamin D3 (as Cholecalciferol) (from Lanolin)
50 mcg (2,000 IU)
250%

Top Medical Research Studies

9.5
Vitamin D benefits IBS patients
We examined how vitamin D supplementation could help improve symptoms for those suffering from irritable bowel syndrome (IBS). This systematic review pulled together findings from four randomized, placebo-controlled trials, with a total of 335 participants, to determine the effectiveness of vitamin D on various IBS measures.

Participants with IBS often struggle with symptoms like pain and discomfort, and vitamin D deficiency has been frequently noted in these individuals. Our research indicated that taking vitamin D could lead to significant improvements in IBS severity compared to a placebo. The results showed that those receiving vitamin D reported notable changes in their IBS severity scores and quality of life scores after the supplementation.

Specifically, after taking vitamin D, participants fared much better in terms of symptom relief than those who received a placebo. While we found some variability in the overall effects on the total score of IBS, the positive outcomes in severity and quality of life were compelling. Overall, our findings suggest that vitamin D supplementation presents a promising option for managing IBS symptoms.
Read More
9
Vitamin D improves IBS management
We aimed to find out how vitamin D supplementation might help those suffering from irritable bowel syndrome (IBS). To do this, we conducted a thorough review of nine randomized controlled trials that included a total of 780 participants.

Our findings showed that vitamin D supplementation significantly improved IBS symptoms and overall quality of life. Specifically, we observed a notable reduction in symptom severity scores and increased satisfaction with life among those taking vitamin D compared to those who did not. Additionally, we confirmed an increase in the levels of serum 25(OH)D, which is crucial for overall health.

Importantly, we also found that the risks of any adverse events while taking vitamin D were low. The results suggest that vitamin D could be a promising option for managing IBS effectively and safely.
Read More
We aimed to understand how vitamin D3 supplementation might help adolescents suffering from irritable bowel syndrome (IBS), especially those who are deficient in vitamin D. Our study involved 112 adolescents diagnosed with IBS, who were split into two groups based on their age and gender.

One group received a daily dose of 2000 IU of oral vitamin D for six months, while the other group received a placebo. To evaluate the impact of the treatment, we assessed vitamin D levels and used various IBS scoring systems before and after the six-month period.

The results were promising for the vitamin D group. We observed significant improvements in both the IBS Severity Scoring System (IBS-SSS) and the quality of life related to IBS (IBS-QoL), with improvements noted at a high level of statistical significance. Additionally, the serum vitamin D levels in the treatment group doubled, which correlates with the improvements in IBS.

Interestingly, the placebo group did not show significant changes in their serum vitamin D levels. Throughout the study, we found that vitamin D supplementation was well tolerated, with no adverse effects reported.

In conclusion, our findings suggest that vitamin D3 supplementation can be quite beneficial for adolescents with IBS and vitamin D deficiency, helping to improve their symptoms and overall quality of life.
Read More

Most Useful Reviews

9.5
Promotes immunity
Vitamin D3 is vital for everyone, reducing the risk of viral diseases and respiratory tract infections. It's essential for immunity and addresses irritable bowel syndrome. D3 controls the absorption of key minerals and supports bone health. Due to limited sunlight, many lack sufficient D3, so supplementation is beneficial. I recommend D3 from NOW; it's high quality and reasonably priced. Almost everyone needs this vitamin!
Read More
9.5
Improved health
I regularly purchase this for my child, and it has significantly increased their vitamin D levels, leading to fewer illnesses. When symptoms arise, I double the dose and recovery is swift. It even helped with the knee pain diagnosed as growing pain syndrome. After raising vitamin D levels, the pain virtually vanished, and calcium absorption improved.
Read More
8
Symptoms relief
Vitamin D deficiency is common, impacting many people worldwide. It helps the body absorb calcium and phosphorus. I've found that taking vitamin D supplements regularly alleviates symptoms of irritable bowel syndrome. The small, yellow capsules are easy to swallow and have no aftertaste. I've not experienced any side effects. If you find my comment helpful, please rate it; I'd be very grateful! Wishing you all good health and happiness!
Read More

Medical Researches

SCIENTIFIC SCORE
Possibly Effective
Based on 27 Researches
7.5
  • All Researches
9.5
Vitamin D benefits IBS patients
We examined how vitamin D supplementation could help improve symptoms for those suffering from irritable bowel syndrome (IBS). This systematic review pulled together findings from four randomized, placebo-controlled trials, with a total of 335 participants, to determine the effectiveness of vitamin D on various IBS measures.

Participants with IBS often struggle with symptoms like pain and discomfort, and vitamin D deficiency has been frequently noted in these individuals. Our research indicated that taking vitamin D could lead to significant improvements in IBS severity compared to a placebo. The results showed that those receiving vitamin D reported notable changes in their IBS severity scores and quality of life scores after the supplementation.

Specifically, after taking vitamin D, participants fared much better in terms of symptom relief than those who received a placebo. While we found some variability in the overall effects on the total score of IBS, the positive outcomes in severity and quality of life were compelling. Overall, our findings suggest that vitamin D supplementation presents a promising option for managing IBS symptoms.
Read More
9
Vitamin D improves IBS management
We aimed to find out how vitamin D supplementation might help those suffering from irritable bowel syndrome (IBS). To do this, we conducted a thorough review of nine randomized controlled trials that included a total of 780 participants.

Our findings showed that vitamin D supplementation significantly improved IBS symptoms and overall quality of life. Specifically, we observed a notable reduction in symptom severity scores and increased satisfaction with life among those taking vitamin D compared to those who did not. Additionally, we confirmed an increase in the levels of serum 25(OH)D, which is crucial for overall health.

Importantly, we also found that the risks of any adverse events while taking vitamin D were low. The results suggest that vitamin D could be a promising option for managing IBS effectively and safely.
Read More
We conducted a study to understand how probiotic 35624 affects irritable bowel syndrome (IBS) in children and adolescents aged 8 to 18. This real-world study, carried out in Chile, involved 64 young participants over a span of 12 weeks, during which we closely monitored their gastrointestinal symptoms.

Throughout the study, participants showed significant improvements in various IBS symptoms measured by specific scoring systems. By week 6 and again at week 12, we saw strong positive changes with 98.3% of them experiencing improvements in three or more IBS domains. This shift was impressive, as the severity of their IBS symptoms moved from moderate or severe to mild or in remission.

Interestingly, the study also looked into vitamin D levels, as vitamin D deficiency is prevalent among children in Latin America. However, we found that low baseline serum vitamin D levels did not correlate with the severity of IBS symptoms or the response to the probiotic treatment. While the improvements were promising, they did not last after a two-week washout period, highlighting the need for more research to understand these effects fully, particularly regarding vitamin D's influence.
Read More
We investigated the impacts of a combination treatment involving probiotics and vitamin D on individuals with irritable bowel syndrome (IBS), specifically those experiencing diarrhea-predominant IBS (IBS-D) or mixed bowel movements (IBS-M). The study involved 246 adults followed by private gastroenterologists, who were given a daily dose of probiotics along with vitamin D over a period of 42 days.

At the end of this timeframe, we found that a significant number of patients—about 62.9%—reported improvements in their symptoms. In fact, there was a notable decrease in the IBS Severity Scoring System scores. This improvement also correlated with enhancements in overall quality of life related to IBS, as well as reductions in anxiety and depression symptoms.

Our findings align with earlier randomized clinical trials, reinforcing the notion that the probiotic and vitamin D combination can be beneficial. While we recognize that this study consolidates the evidence of such a combination rather than isolating the effects of vitamin D alone, the results suggest that including vitamin D in treatment plans may indeed foster better mental and gut health for those suffering from IBS.
Read More
We aimed to understand how vitamin D treatment affects individuals with irritable bowel syndrome (IBS) who didn’t have any identifiable stressors contributing to their symptoms. For this study, we provided vitamin D supplements to patients over a three-month period. Of the patients, 97 had their vitamin D levels checked again, showing sufficient improvement, while 14 were lost to follow-up.

Our approach suggested that intramuscular injections were the best form of treatment, but interestingly, we found that 34 of the participants opted for oral supplements. Those taking oral vitamin D displayed a lesser increase in serum vitamin D levels compared to those receiving injections.

The results were promising: over half, specifically 56.7%, reported complete relief from their IBS symptoms after vitamin D replacement. Additionally, 36.1% experienced significant improvement, and 6.2% noted moderate relief. The study also highlighted that even though many found relief, we need to consider the 14 individuals lost to follow-up when interpreting the overall effectiveness.
Read More

User Reviews

USERS' SCORE
Good
Based on 4 Reviews
8.4
  • All Reviews
  • Positive Reviews
  • Negative Reviews
9.5
Promotes immunity
Vitamin D3 is vital for everyone, reducing the risk of viral diseases and respiratory tract infections. It's essential for immunity and addresses irritable bowel syndrome. D3 controls the absorption of key minerals and supports bone health. Due to limited sunlight, many lack sufficient D3, so supplementation is beneficial. I recommend D3 from NOW; it's high quality and reasonably priced. Almost everyone needs this vitamin!
Read More
9.5
Improved health
I regularly purchase this for my child, and it has significantly increased their vitamin D levels, leading to fewer illnesses. When symptoms arise, I double the dose and recovery is swift. It even helped with the knee pain diagnosed as growing pain syndrome. After raising vitamin D levels, the pain virtually vanished, and calcium absorption improved.
Read More
8
Symptoms relief
Vitamin D deficiency is common, impacting many people worldwide. It helps the body absorb calcium and phosphorus. I've found that taking vitamin D supplements regularly alleviates symptoms of irritable bowel syndrome. The small, yellow capsules are easy to swallow and have no aftertaste. I've not experienced any side effects. If you find my comment helpful, please rate it; I'd be very grateful! Wishing you all good health and happiness!
Read More
8.8
Increased energy
This vitamin is the best supplement! I was prescribed it for depression, and after a month, I noticed a significant difference. I feel more energetic, and life feels easier. My partner had various health issues, including irritable bowel syndrome, and after taking this supplement, all his problems improved.
Read More

Frequently Asked Questions

Irritable Bowel Syndrome (IBS) is a common gastrointestinal disorder characterized by a range of symptoms including abdominal pain, bloating, gas, and altered bowel habits, which can manifest as diarrhea, constipation, or a combination of both. The exact cause of IBS isn't fully understood, but it's believed to stem from a complex interplay of factors including gut sensitivity, changes in gut motility, and psychosocial elements such as stress or anxiety. IBS is often classified into different types based on the predominant symptoms, such as IBS with diarrhea (IBS-D), IBS with constipation (IBS-C), and a mixed type (IBS-M).

Managing IBS can be multifaceted, often requiring a tailored approach based on individual symptoms and triggers. Dietary changes are frequently recommended, including low-FODMAP diets, which involve reducing fermentable carbohydrates that can exacerbate symptoms. In addition to dietary adjustments, stress management techniques and medications aimed at addressing specific symptoms, such as anti-diarrheal agents or laxatives, may also be beneficial. Since IBS can significantly impact quality of life, consulting with a healthcare provider or a registered dietitian is essential for developing an effective management plan.

Vitamin D is a fat-soluble vitamin that's essential for maintaining healthy bones and teeth, supporting immune system function, and facilitating normal cell growth and development. It plays a crucial role in calcium absorption in the gut, which is vital for bone health. Unlike most vitamins, our bodies can produce Vitamin D when exposed to sunlight, specifically UVB rays, which is why it’s often referred to as the "sunshine vitamin." However, depending on your geographical location, lifestyle, and skin type, getting sufficient Vitamin D from the sun alone can be challenging, particularly during the winter months.

In addition to sunlight, Vitamin D can be obtained from certain foods such as fatty fish (like salmon and mackerel), fish liver oils, and fortified foods like milk and cereals. Some individuals may also consider supplements, especially if they're at risk for deficiency. Insufficient vitamin D levels are linked to various health issues, including rickets in children, osteomalacia in adults, and even an increased risk of chronic diseases. Regularly checking your vitamin D levels and consulting with a healthcare professional can help ensure you're meeting your needs for optimal health.

Based on user reviews, the timeframe for seeing results from Vitamin D supplements for Irritable Bowel Syndrome can vary. Many users note positive changes after consistent use, with some reporting improvements in symptoms after just a month. For instance, one user mentioned that after taking the supplement regularly, they found relief from their IBS symptoms and appreciated the ease of swallowing the capsules without side effects (Read Review).

Another user highlighted significant overall health improvements, including IBS benefits, after approximately a month of usage. This suggests that while individual experiences may differ, a month of consistent supplementation could lead to noticeable results for many (Read Review). Given the commonality of Vitamin D deficiency, it's likely that regular supplementation not only helps with IBS but also contributes to overall wellness.

Based on a robust collection of studies, there is compelling evidence suggesting that vitamin D supplementation could support individuals with Irritable Bowel Syndrome (IBS). A systematic review identified moderate evidence indicating that those with low vitamin D levels might experience notable improvements in IBS symptoms and overall quality of life following supplementation ([2]). Furthermore, multiple randomized controlled trials reported significant reductions in IBS symptom severity among participants receiving vitamin D compared to placebo groups, suggesting it may be a viable option for symptom management ([15]).

Additionally, the use of innovative formulations like Vitamin D3 complexed with nanosponges has shown promise in enhancing gut health and reducing inflammation associated with IBS, further supporting the vitamin's therapeutic potential ([17]). Although findings are generally favorable, not all studies reached statistically significant results concerning symptom severity or overall quality of life, indicating that while vitamin D can be beneficial, it should not be deemed a standalone treatment for managing IBS ([13]). Overall, individuals with IBS—particularly those identified as vitamin D deficient—should consider discussing supplementation with healthcare providers as part of a comprehensive management strategy.

Based on user reviews, many individuals have reported notable improvements in their symptoms after taking vitamin D supplements, particularly concerning conditions like Irritable Bowel Syndrome (IBS). One user specifically mentioned that regular supplementation not only alleviated their IBS symptoms but also contributed to their overall well-being by enhancing mineral absorption and supporting immunity (Read Review). Another user highlighted a swift recovery from symptoms upon increasing the dosage during illness, linking their child's improved health to higher vitamin D levels, which also resolved knee pain previously diagnosed as growing pains (Read Review).

Additionally, users have reported feeling more energetic, with one individual stating that their partner experienced significant improvement across various health issues, including IBS, after a month of taking the supplement (Read Review). While these anecdotal experiences suggest a positive trend in symptom relief for many, it's vital to remember that individual results can vary significantly, and not everyone may experience the same level of improvement.

Users have reported positive experiences when combining Vitamin D supplements with other dietary or health interventions for managing Irritable Bowel Syndrome (IBS). One user highlighted how their child's health significantly improved after increasing the vitamin D dosage during illness, noting a swift recovery from various symptoms, including those related to IBS (Read Review). This suggests that a tailored approach, wherein users adapt their supplement intake based on specific health needs, can be effective.

Moreover, several users echoed the benefits of regular Vitamin D supplementation, emphasizing its role in alleviating IBS symptoms. One reviewer remarked on the significant improvements they observed after making vitamin D a regular part of their routine, which led to better overall well-being and energy levels (Read Review). Overall, these user accounts indicate that combining vitamin D with other health practices might enhance results for those managing IBS symptoms.

Users report that Vitamin D, particularly in its D3 form, plays a crucial role in alleviating symptoms of Irritable Bowel Syndrome (IBS). One user noted that regular supplementation has significantly reduced their IBS symptoms, highlighting the essential benefits of Vitamin D in the body, such as aiding mineral absorption and promoting overall health (Read Review). Another review emphasized the importance of proper dosing, suggesting that doubling the dose when symptoms arise can lead to swift recovery, which showcases an approach to managing IBS flare-ups through adjusted Vitamin D intake (Read Review).

While specific dosing can vary among individuals, it is clear from the reviews that Vitamin D supplementation has widespread benefits for those experiencing IBS. Many users suggest that ensuring adequate Vitamin D levels can be a game changer for managing symptoms effectively, with some reporting notable health improvements after consistent use (Read Review). With the commonality of Vitamin D deficiency, users almost unanimously recommend regular supplementation to better health and wellbeing.

8
Symptoms relief
Vitamin D deficiency is common, impacting many people worldwide. It helps the body absorb calcium and phosphorus. I've found that taking vitamin D supplements regularly alleviates symptoms of irritable bowel syndrome. The small, yellow capsules are easy to swallow and have no aftertaste. I've not experienced any side effects. If you find my comment helpful, please rate it; I'd be very grateful! Wishing you all good health and happiness!
8.8
Increased energy
This vitamin is the best supplement! I was prescribed it for depression, and after a month, I noticed a significant difference. I feel more energetic, and life feels easier. My partner had various health issues, including irritable bowel syndrome, and after taking this supplement, all his problems improved.
9.5
Promotes immunity
Vitamin D3 is vital for everyone, reducing the risk of viral diseases and respiratory tract infections. It's essential for immunity and addresses irritable bowel syndrome. D3 controls the absorption of key minerals and supports bone health. Due to limited sunlight, many lack sufficient D3, so supplementation is beneficial. I recommend D3 from NOW; it's high quality and reasonably priced. Almost everyone needs this vitamin!
9.5
Improved health
I regularly purchase this for my child, and it has significantly increased their vitamin D levels, leading to fewer illnesses. When symptoms arise, I double the dose and recovery is swift. It even helped with the knee pain diagnosed as growing pain syndrome. After raising vitamin D levels, the pain virtually vanished, and calcium absorption improved.
7
Vitamin D may enhance IBS outcomes
We sought to understand whether vitamin D intake and status could help alleviate symptoms and improve the quality of life for adults suffering from irritable bowel syndrome (IBS). Our investigation involved a systematic review and meta-analysis of various studies, including clinical trials and observational studies that looked at vitamin D's effects on IBS-related outcomes.

After analyzing the data, we found moderate evidence suggesting that vitamin D supplementation can enhance serum vitamin D levels in adults with IBS. Notably, those individuals who began with low or deficient vitamin D status experienced improvements in their quality of life following supplementation. However, it is important to highlight that while these findings indicate potential benefits, the overall impact of vitamin D on symptom severity in IBS is still being explored, and results can vary among individuals.

In summary, vitamin D supplementation could be a promising avenue for those with IBS, particularly for those with a deficiency. It's an exciting area of research that could lead to better health outcomes for many.
9.5
Vitamin D benefits IBS patients
We examined how vitamin D supplementation could help improve symptoms for those suffering from irritable bowel syndrome (IBS). This systematic review pulled together findings from four randomized, placebo-controlled trials, with a total of 335 participants, to determine the effectiveness of vitamin D on various IBS measures.

Participants with IBS often struggle with symptoms like pain and discomfort, and vitamin D deficiency has been frequently noted in these individuals. Our research indicated that taking vitamin D could lead to significant improvements in IBS severity compared to a placebo. The results showed that those receiving vitamin D reported notable changes in their IBS severity scores and quality of life scores after the supplementation.

Specifically, after taking vitamin D, participants fared much better in terms of symptom relief than those who received a placebo. While we found some variability in the overall effects on the total score of IBS, the positive outcomes in severity and quality of life were compelling. Overall, our findings suggest that vitamin D supplementation presents a promising option for managing IBS symptoms.
8
Vitamin D3 enhances IBS treatment
We explored the effects of a novel form of Vitamin D3, known as VitD3-NS, on individuals suffering from irritable bowel syndrome (IBS). This Vitamin D3 was complexed within cyclodextrin nanosponges to enhance its solubility and stability, which is vital because these properties can significantly affect the vitamin's biological activity.

Our study examined how VitD3-NS interacts with both healthy and IBS-affected gut-brain axes. We observed that this innovative formulation was effective in mitigating damage caused by liposaccharides, a common inflammatory factor, in the gut. Specifically, when tested at a concentration of 100 ng/mL for 48 hours, VitD3-NS helped restore the viability and integrity of crucial cells called tight junctions. It also reduced markers of oxidative stress, such as reactive oxygen species and cytokines.

Following intestinal transit, we noticed improvements in neurodegenerative conditions for both healthy individuals and those with IBS. This suggests that the protective benefits of VitD3-NS are preserved even under challenging IBS conditions, boosting its efficacy by approximately 50%. Consequently, our findings indicate that this form of Vitamin D3 could provide significant support for gut health and overall well-being for those dealing with IBS.
5
Vitamin D's mixed impact on IBS
We explored the relationship between vitamin D supplementation and its impact on individuals suffering from irritable bowel syndrome (IBS). This systematic review and meta-analysis analyzed data from six randomized controlled trials, which included a total of 616 patients.

Our findings showed no significant improvement in the overall severity of IBS symptoms, as measured by the Irritable Bowel Severity Scoring System (IBS-SSS). The difference between the vitamin D group and placebo was relatively small, suggesting that vitamin D may not be a game-changer for managing IBS symptoms.

However, we did observe a positive effect of vitamin D on the quality of life for IBS patients. When looking at the IBS quality of life (IBS-QoL) scores, there was a noticeable improvement for those taking vitamin D compared to the placebo group.

Furthermore, vitamin D supplementation significantly increased serum levels of calcifediol, indicating that the treatment was effective in raising vitamin D levels in participants. It's important to note, though, that further clinical trials are necessary to fully understand these effects and to generate findings that are widely applicable.

References

  1. Qi S, Zhao M, Sun Y, Boro S, Arora B, et al. Impact of vitamin D supplementation on symptom severity and quality of life in patients with irritable bowel syndrome: A meta-analysis. Adv Clin Exp Med. 2025. doi:10.17219/acem/191463
  2. Cara KC, Taylor SF, Alhmly HF, Wallace TC. The effects of vitamin D intake and status on symptom severity and quality-of-life in adults with irritable bowel syndrome (IBS): a systematic review and meta-analysis. Crit Rev Food Sci Nutr. 2024. doi:10.1080/10408398.2024.2400603
  3. Cruchet Muñoz S, Verbeke Palma S, Lera Marqués L, Espinosa Pizarro MN, Malig Mechasqui J, et al. Effects of 35624 in Children and Adolescents with Irritable Bowel Syndrome. Nutrients. 2024;16. doi:10.3390/nu16121967
  4. Jouët P, Altman C, Bruley DES Varannes S, Juhel C, Henri F. Probiotics plus vitamin D in irritable bowel syndrome: a prospective multicentric non-interventional study. Minerva Gastroenterol (Torino). 2024;70:332. doi:10.23736/S2724-5985.24.03581-2
  5. Uberti F, Trotta F, Cavalli R, Galla R, Caldera F, et al. Enhancing Vitamin D3 Efficacy: Insights from Complexation with Cyclodextrin Nanosponges and Its Impact on Gut-Brain Axes in Physiology and IBS Syndrome. Int J Mol Sci. 2024;25. doi:10.3390/ijms25042189
  6. Xu S, Luo Q, He J, Chen X, Li S, et al. Causal associations of 25-hydroxyvitamin D with functional gastrointestinal disorders: a two-sample Mendelian randomization study. Genes Nutr. 2023;18:14. doi:10.1186/s12263-023-00734-1
  7. Kesavan C, Das A, Goyal P, Jackson CS, Strong DD, et al. Vitamin D Deficiency (VDD) and Benefits of Supplementation in Veterans with IBS-D. Diagnostics (Basel). 2023;13. doi:10.3390/diagnostics13172807
  8. Yan C, Hu C, Chen X, Jia X, Zhu Z, et al. Vitamin D improves irritable bowel syndrome symptoms: A meta-analysis. Heliyon. 2023;9:e16437. doi:10.1016/j.heliyon.2023.e16437
  9. Yu XL, Wu QQ, He LP, Zheng YF. Role of in vitamin D in irritable bowel syndrome. World J Clin Cases. 2023;11:2677. doi:10.12998/wjcc.v11.i12.2677
  10. Alvi H, Ali G, Iqbal S, Ahsan MN, Siddiqui MA, et al. Role of 25-hydroxyvitamin D in irritable bowel syndrome patients. J Family Med Prim Care. 2022;11:7975. doi:10.4103/jfmpc.jfmpc_1336_22
  11. Abdelmalak MFL, Abdelrahim DS, George Michael TMA, Abdel-Maksoud OM, Labib JMW. Vitamin D and lactoferrin attenuate stress-induced colitis in Wistar rats via enhancing AMPK expression with inhibiting mTOR-STAT3 signaling and modulating autophagy. Cell Biochem Funct. 2023;41:211. doi:10.1002/cbf.3774
  12. Grozić A, Coker K, Dussik CM, Sabir MS, Sabir Z, et al. Identification of putative transcriptomic biomarkers in irritable bowel syndrome (IBS): Differential gene expression and regulation of TPH1 and SERT by vitamin D. PLoS One. 2022;17:e0275683. doi:10.1371/journal.pone.0275683
  13. Abuelazm M, Muhammad S, Gamal M, Labieb F, Amin MA, et al. The Effect of Vitamin D Supplementation on the Severity of Symptoms and the Quality of Life in Irritable Bowel Syndrome Patients: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutrients. 2022;14. doi:10.3390/nu14132618
  14. Bin Y, Kang L, Lili Y. Vitamin D status in irritable bowel syndrome and the impact of supplementation on symptoms: a systematic review and meta-analysis. Nutr Hosp. 2022;39:1144. doi:10.20960/nh.04044
  15. Huang H, Lu L, Chen Y, Zeng Y, Xu C. The efficacy of vitamin D supplementation for irritable bowel syndrome: a systematic review with meta-analysis. Nutr J. 2022;21:24. doi:10.1186/s12937-022-00777-x
  16. Chong RIH, Yaow CYL, Loh CYL, Teoh SE, Masuda Y, et al. Vitamin D supplementation for irritable bowel syndrome: A systematic review and meta-analysis. J Gastroenterol Hepatol. 2022;37:993. doi:10.1111/jgh.15852
  17. Uberti F, Trotta F, Cavalli R, Galla R, Caldera F, et al. Enhancing Vitamin D3 Efficacy: Insights from Complexation with Cyclodextrin Nanosponges and Its Impact on Gut-Brain Axes in Physiology and IBS Syndrome. Int J Mol Sci. 2024;25. doi:10.3390/ijms25042189
  18. Abdelmalak MFL, Abdelrahim DS, George Michael TMA, Abdel-Maksoud OM, Labib JMW. Vitamin D and lactoferrin attenuate stress-induced colitis in Wistar rats via enhancing AMPK expression with inhibiting mTOR-STAT3 signaling and modulating autophagy. Cell Biochem Funct. 2023;41:211. doi:10.1002/cbf.3774
  19. Williams CE, Williams EA, Corfe BM. Vitamin D supplementation in people with IBS has no effect on symptom severity and quality of life: results of a randomised controlled trial. Eur J Nutr. 2022;61:299. doi:10.1007/s00394-021-02633-w
  20. Khalighi Sikaroudi M, Mokhtare M, Shidfar F, Janani L, Faghihi Kashani A, et al. Effects of vitamin D3 supplementation on clinical symptoms, quality of life, serum serotonin (5-hydroxytryptamine), 5-hydroxy-indole acetic acid, and ratio of 5-HIAA/5-HT in patients with diarrhea-predominant irritable bowel syndrome: A randomized clinical trial. EXCLI J. 2020;19:652. doi:10.17179/excli2020-2247
  21. Khalighi Sikaroudi M, Mokhtare M, Janani L, Faghihi Kashani AH, Masoodi M, et al. Vitamin D3 Supplementation in Diarrhea-Predominant Irritable Bowel Syndrome Patients: The Effects on Symptoms Improvement, Serum Corticotropin-Releasing Hormone, and Interleukin-6 - A Randomized Clinical Trial. Complement Med Res. 2020;27:302. doi:10.1159/000506149
  22. Jalili M, Vahedi H, Poustchi H, Hekmatdoost A. Soy isoflavones and cholecalciferol reduce inflammation, and gut permeability, without any effect on antioxidant capacity in irritable bowel syndrome: A randomized clinical trial. Clin Nutr ESPEN. 2019;34:50. doi:10.1016/j.clnesp.2019.09.003
  23. Abbasnezhad A, Amani R, Hasanvand A, Yousefi Rad E, Alipour M, et al. Association of Serum Vitamin D Concentration With Clinical Symptoms and Quality of Life in Patients With Irritable Bowel Syndrome. J Am Coll Nutr. 2019;38:327. doi:10.1080/07315724.2018.1510349
  24. Amani R, Abbasnezhad A, Hajiani E, Cheraghian B, Abdoli Z, et al. Vitamin D3 Induced Decrease in IL-17 and Malondialdehyde, and Increase in IL-10 and Total Antioxidant Capacity Levels in Patients with Irritable Bowel Syndrome. Iran J Immunol. 2018;15:186. doi:10.22034/IJI.2018.39388
  25. El Amrousy D, Hassan S, El Ashry H, Yousef M, Hodeib H. Vitamin D supplementation in adolescents with irritable bowel syndrome: Is it useful? A randomized controlled trial. Saudi J Gastroenterol. 2018;24:109. doi:10.4103/sjg.SJG_438_17
  26. Abbasnezhad A, Amani R, Hajiani E, Alavinejad P, Cheraghian B, et al. Effect of vitamin D on gastrointestinal symptoms and health-related quality of life in irritable bowel syndrome patients: a randomized double-blind clinical trial. Neurogastroenterol Motil. 2016;28:1533. doi:10.1111/nmo.12851
  27. Sprake EF, Grant VA, Corfe BM. Vitamin D3 as a novel treatment for irritable bowel syndrome: single case leads to critical analysis of patient-centred data. BMJ Case Rep. 2012;2012. doi:10.1136/bcr-2012-007223
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