Overview

SCIENTIFIC SCORE
Questionable
Based on 5 Researches
5.5
USERS' SCORE
Good
Based on 25 Reviews
8.8
Supplement Facts
Serving Size: 1 Softgel
Amount Per Serving
%DV
Vitamin D3 (as Cholecalciferol) (From Lanolin)
1,250 mcg (50,000 IU)
6250%

Top Medical Research Studies

We conducted a thorough investigation into whether high-dose intermittent vitamin D3 could alleviate symptoms of chronic fatigue syndrome (CFS) and improve vascular health. This double-blind, randomized placebo-controlled trial involved patients meeting established criteria for CFS. Participants received either 100,000 units of vitamin D3 or a placebo every two months for six months.

Over the course of the study, we measured key outcomes such as arterial stiffness, blood pressure, cholesterol levels, and fatigue levels through various tests. Surprisingly, our findings showed that vitamin D3 treatment did not lead to any significant improvements in these areas. We observed only a slight increase in vitamin D levels in the treatment group, but this did not translate into better vascular health or reduced fatigue.

In conclusion, we honestly found that high-dose vitamin D3 did not offer any notable benefits for patients struggling with chronic fatigue syndrome. This study highlights the complexities of treating CFS and suggests that vitamin D3 may not be the solution some had hoped for.
Read More
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.
Read More
9.5
Vitamin D treatment enhances alertness
We explored the impact of vitamin D treatment on a case of excessive daytime sleepiness (EDS), specifically in the context of chronic fatigue syndrome. A 28-year-old woman was found to have low levels of vitamin D after experiencing four months of overwhelming fatigue and sleepiness, despite being tested for sleep disorders.

After starting vitamin D supplementation, her condition improved remarkably within just two weeks. Along with a boost in alertness, her associated symptoms like muscle pain and headaches began to fade. By the end of the treatment, her score on the Epworth Sleepiness Scale, which measures daytime sleepiness, dropped significantly, indicating much better daytime function.

This case suggests that vitamin D may play a role in improving symptoms commonly linked to chronic fatigue syndrome. While more research is needed to fully understand the mechanisms behind this improvement, our findings open the door to potentially screening patients with chronic fatigue for vitamin D deficiency to expedite treatment.
Read More

Most Useful Reviews

9.5
Improved alertness
I visited a therapist due to chronic fatigue syndrome and discovered I was deficient in vitamin D. This vitamin is crucial for maintaining healthy bones and the immune system. After replenishing my levels, my energy improved significantly, and I became more active.
Read More
9.5
Effective for immunity
Vitamin D3 is essential, especially for those like me with chronic fatigue syndrome and autoimmune conditions. It boosts immunity, alleviates depression, and benefits joint and muscle health. It's best taken with a fatty meal and vitamin K2 to aid absorption, showing significant improvements in my condition.
Read More
9.5
Reduced fatigue
Suffering from chronic fatigue syndrome and other symptoms, I found that vitamin D supplementation helped reduce my hair loss and depression. After eight weeks of treatment—one pill per week—my fatigue and joint pain lessened significantly, improving my overall well-being.
Read More

Medical Researches

SCIENTIFIC SCORE
Questionable
Based on 5 Researches
5.5
  • All Researches
9.5
Vitamin D treatment enhances alertness
We explored the impact of vitamin D treatment on a case of excessive daytime sleepiness (EDS), specifically in the context of chronic fatigue syndrome. A 28-year-old woman was found to have low levels of vitamin D after experiencing four months of overwhelming fatigue and sleepiness, despite being tested for sleep disorders.

After starting vitamin D supplementation, her condition improved remarkably within just two weeks. Along with a boost in alertness, her associated symptoms like muscle pain and headaches began to fade. By the end of the treatment, her score on the Epworth Sleepiness Scale, which measures daytime sleepiness, dropped significantly, indicating much better daytime function.

This case suggests that vitamin D may play a role in improving symptoms commonly linked to chronic fatigue syndrome. While more research is needed to fully understand the mechanisms behind this improvement, our findings open the door to potentially screening patients with chronic fatigue for vitamin D deficiency to expedite treatment.
Read More
8
We conducted a double-blind, placebo-controlled trial to evaluate the effects of an oral food supplement (OFS) on long COVID patients, particularly focusing on chronic inflammation and fatigue. The supplement included components like rosehip, propolis, royal jelly, and zinc, with vitamin C being a key ingredient.

Through our two-month study, which involved giving participants either the OFS or a placebo, we made some interesting observations. Notably, patients who took the OFS experienced a significant reduction in inflammatory markers, which are often linked to chronic fatigue syndrome. This included improvements in the neutrophil-to-lymphocyte and monocyte-to-lymphocyte ratios.

We also noted a substantial increase in vitamin D levels among those taking the supplement, which correlated with enhanced quality of life and decreased fatigue as measured by the fatigue severity scale. Our findings suggest that the combination of ingredients in the OFS, particularly its vitamin D content, can help alleviate some symptoms associated with long COVID, especially chronic fatigue.

However, since the supplement included multiple active ingredients, isolating the specific impact of vitamin D on chronic fatigue syndrome is challenging. Still, the overall results indicate positive changes for patients dealing with the lingering effects of COVID.
Read More
8
Beta-glucan shows cognitive improvements
We conducted a randomized, double-blind, placebo-controlled trial to explore how yeast beta-glucan, along with multivitamins, affects individuals suffering from Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS). In our study, 65 participants received either beta-glucan combined with vitamins and zinc or a placebo for 36 weeks.

Interestingly, while our primary focus was on beta-glucan, which was shown to significantly improve cognitive fatigue, the role of vitamin D3 within this combination was not clearly established. This makes it challenging to directly assess the impact of vitamin D3 alone on chronic fatigue syndrome outcomes.

Overall, we discovered that beta-glucan supplementation could positively influence cognitive fatigue, offering promise for future research on nutritional support in ME/CFS patients. However, definitive conclusions about vitamin D3's effectiveness remain inconclusive due to the combined nature of the treatment.
Read More
We conducted a thorough investigation into whether high-dose intermittent vitamin D3 could alleviate symptoms of chronic fatigue syndrome (CFS) and improve vascular health. This double-blind, randomized placebo-controlled trial involved patients meeting established criteria for CFS. Participants received either 100,000 units of vitamin D3 or a placebo every two months for six months.

Over the course of the study, we measured key outcomes such as arterial stiffness, blood pressure, cholesterol levels, and fatigue levels through various tests. Surprisingly, our findings showed that vitamin D3 treatment did not lead to any significant improvements in these areas. We observed only a slight increase in vitamin D levels in the treatment group, but this did not translate into better vascular health or reduced fatigue.

In conclusion, we honestly found that high-dose vitamin D3 did not offer any notable benefits for patients struggling with chronic fatigue syndrome. This study highlights the complexities of treating CFS and suggests that vitamin D3 may not be the solution some had hoped for.
Read More
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.
Read More

User Reviews

USERS' SCORE
Good
Based on 25 Reviews
8.8
  • All Reviews
  • Positive Reviews
  • Negative Reviews
9.5
Improved alertness
I visited a therapist due to chronic fatigue syndrome and discovered I was deficient in vitamin D. This vitamin is crucial for maintaining healthy bones and the immune system. After replenishing my levels, my energy improved significantly, and I became more active.
Read More
9.5
Effective for immunity
Vitamin D3 is essential, especially for those like me with chronic fatigue syndrome and autoimmune conditions. It boosts immunity, alleviates depression, and benefits joint and muscle health. It's best taken with a fatty meal and vitamin K2 to aid absorption, showing significant improvements in my condition.
Read More
9.5
Reduced fatigue
Suffering from chronic fatigue syndrome and other symptoms, I found that vitamin D supplementation helped reduce my hair loss and depression. After eight weeks of treatment—one pill per week—my fatigue and joint pain lessened significantly, improving my overall well-being.
Read More
9.5
Improved alertness
Wonderful! I consulted a therapist about my chronic fatigue syndrome, and discovered a vitamin D deficiency. After completing the course, my tests returned to normal, and I feel more alert and active.
Read More
9.5
Enhanced overall health
This vitamin D product is excellent for addressing symptoms like chronic fatigue syndrome. With a prescription for the high dose of 50,000 IU, it's crucial to consult a doctor before use. After taking it weekly, I've seen overall health improvements, especially in my hair, bones, and joints.
Read More

Frequently Asked Questions

Chronic Fatigue Syndrome (CFS), also known as Myalgic Encephalomyelitis (ME), is a complex and debilitating condition characterized by profound fatigue that doesn’t improve with rest and worsens with physical or mental activity. This crippling fatigue is often accompanied by a variety of symptoms, including sleep disturbances, cognitive difficulties, muscle pain, and joint pain. Unlike typical tiredness, the fatigue experienced in CFS is long-lasting, and it can significantly hinder everyday activities and overall quality of life.

The precise cause of CFS remains unknown, but it is believed to be influenced by a combination of genetic, environmental, immunological, and psychological factors. Diagnosis primarily relies on a careful assessment of symptoms, as there are no definitive laboratory tests available. Treatment options focus on symptom management and may include lifestyle changes, physical therapy, medication for pain management, and cognitive behavioral therapy. Given the complexity and variability of the condition, individuals with CFS should consult healthcare professionals who specialize in this area to develop personalized management strategies.

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.

Chronic Fatigue Syndrome (CFS) is a complex disorder characterized by extreme fatigue that doesn't improve with rest and may be exacerbated by physical or mental activity. While the causes of CFS remain unclear, there is ongoing research into various interventions that may alleviate its symptoms, including vitamin D supplementation. Some studies suggest that low levels of vitamin D could be linked to fatigue and may play a role in immune function, potentially impacting CFS. However, definitive clinical evidence confirming that vitamin D can help specifically with CFS is still lacking.

If you suspect that low vitamin D levels could be contributing to your fatigue, it might be worthwhile to discuss this with your healthcare provider. They can recommend blood tests to assess your vitamin D status and evaluate the potential benefits of supplementation if necessary. It's important to approach any treatment plan for Chronic Fatigue Syndrome comprehensively, as this multifaceted condition often requires a combination of therapies tailored to individual needs.

As reported by several users, the time it takes to notice improvements from vitamin D supplementation for Chronic Fatigue Syndrome can vary, with results typically observed within a few weeks to two months. One user mentioned seeing noticeable improvements in energy levels after just two weeks of use (Read Review). Meanwhile, another user noted that after eight weeks of consistent treatment, symptoms such as fatigue and joint pain significantly lessened (Read Review).

There's a consensus that consistent weekly intake, often coupled with professional medical guidance, is crucial for achieving desired health outcomes. Some users have recommended a weekly dose of 50,000 IU after consulting with their doctors, leading to improvements not only in fatigue but also in other health parameters like mood and muscle strength (Read Review). Overall, while individual experiences may vary, many find that they begin to feel the benefits of vitamin D supplementation within a month or two.

The efficacy of certain supplements for Chronic Fatigue Syndrome (CFS) has garnered attention in scientific research, but the results remain mixed. One study examined the benefits of a multi-component oral food supplement (OFS) for long COVID patients, highlighting that it positively impacted inflammatory markers and vitamin D levels, which seemed to correlate with reduced fatigue [1]. However, isolating the specific contributions of vitamin D from other ingredients in the OFS poses challenges in definitively linking it to CFS relief.

On the other hand, research specifically evaluating high-dose vitamin D3 for CFS has shown less promising results. Two separate studies both concluded that high doses of vitamin D3 (100,000 units every two months) did not significantly improve fatigue or vascular health indicators in CFS patients [5]. Additionally, another investigation into the use of beta-glucan and multivitamins noted improvements in cognitive fatigue, but again, the individual effects of vitamin D3 were inconclusive [4]. This suggests that while vitamin D may have some benefits in individual cases, as illustrated by a case study showing improvement after vitamin D supplementation, the broader scientific consensus does not support it as a standalone treatment for CFS at this time [3].

Based on user reviews, many individuals have reported noticeable improvements in their symptoms of chronic fatigue syndrome after supplementing with vitamin D. For instance, one user shared that upon addressing their vitamin D deficiency, they experienced significant increases in energy levels and overall activity, describing how they felt more alert and active (Read Review). Another review highlighted that after eight weeks of treatment, symptoms such as fatigue and joint pain were considerably reduced, alongside improvements in hair loss and mood (Read Review).

Several participants also noted how their quality of life improved: one user reported a substantial boost in energy during workouts, while another emphasized the alleviation of joint pain and depression (Read Review). Users have consistently recommended high dosages, often around 50,000 IU, which they found effective after consulting with healthcare professionals (Read Review). While individual results can vary based on personal health conditions and adherence to supplementation, the general sentiment indicates that vitamin D plays a crucial role in managing chronic fatigue syndrome symptoms, enhancing both energy and overall well-being.

Based on user reviews, many individuals with chronic fatigue syndrome reported positive outcomes when combining vitamin D supplementation with other health practices. Users highlighted the importance of pairing vitamin D3 with vitamin K2 to enhance absorption, especially since both nutrients can work synergistically to support immune health and reduce fatigue-related symptoms (Read Review). Additionally, a consistent intake of vitamin D—often recommended at high dosages, such as 50,000 IU weekly—was noted as beneficial, significantly improving energy levels, joint health, and overall well-being (Read Review).

Users have also described how maintaining a balanced diet, like consuming vitamin D with fatty meals, contributed to the effectiveness of their supplementation regimen (Read Review). Furthermore, reports indicate that those who combined vitamin D with lifestyle changes, such as exercise and improved sleep, experienced even more pronounced benefits in alleviating chronic fatigue syndrome symptoms (Read Review). Overall, while individual experiences vary, the general consensus reflects that a thoughtful approach to supplementation—as well as combining vitamins—can lead to substantial improvements in managing chronic fatigue syndrome.

Users reported that the right dose for Vitamin D in treating Chronic Fatigue Syndrome often revolves around high doses, particularly citing a frequency of 50,000 IU. Many reviews emphasized the importance of consulting a doctor before starting such a regimen, with one user noting, "With a prescription for the high dose of 50,000 IU, it’s crucial to consult a doctor before use" (Read Review). Another user echoed this by recommending taking a pill of 50,000 units once a week for optimal effects (Read Review).

Several reviewers reported significant improvements in their symptoms with this dosage, noting increased energy levels and a reduction in fatigue after just a few weeks of consistent intake (Read Review), (Read Review). The general consensus among users is that a high-dose Vitamin D supplement can effectively combat the debilitating effects of Chronic Fatigue Syndrome, contributing to better overall health when used responsibly and under medical guidance (Read Review).

6.3
Improved condition
After two weeks of taking this vitamin D, I noticed an improvement in my chronic fatigue syndrome, which had caused severe hair loss and lethargy.
9.5
Reduced fatigue
Suffering from chronic fatigue syndrome and other symptoms, I found that vitamin D supplementation helped reduce my hair loss and depression. After eight weeks of treatment—one pill per week—my fatigue and joint pain lessened significantly, improving my overall well-being.
9.5
Enhanced overall health
This vitamin D product is excellent for addressing symptoms like chronic fatigue syndrome. With a prescription for the high dose of 50,000 IU, it's crucial to consult a doctor before use. After taking it weekly, I've seen overall health improvements, especially in my hair, bones, and joints.
9.5
Improved alertness
I visited a therapist due to chronic fatigue syndrome and discovered I was deficient in vitamin D. This vitamin is crucial for maintaining healthy bones and the immune system. After replenishing my levels, my energy improved significantly, and I became more active.
4.5
Increased energy
I felt energised since taking this product, and my chronic fatigue syndrome has lessened. I can now exercise well, with a noticeable reduction in fatigue during my workouts.
9.5
Effective for immunity
Vitamin D3 is essential, especially for those like me with chronic fatigue syndrome and autoimmune conditions. It boosts immunity, alleviates depression, and benefits joint and muscle health. It's best taken with a fatty meal and vitamin K2 to aid absorption, showing significant improvements in my condition.
8.8
Promotes healing
Vitamin D is vital for preventing chronic fatigue syndrome symptoms such as hair loss and osteoporosis. I recommend taking a pill of 50,000 units once a week; it is easy to swallow and has a reasonable price. This vitamin significantly contributes to overall health.
9.5
Reduced fatigue
This product has been great for my chronic fatigue syndrome. After taking it weekly for two months, my vitamin D levels are now above average. I have much more energy and significantly reduced fatigue.
8
Restored vitality
I suffer from chronic fatigue syndrome and have experienced lethargy and joint pain. After multiple tests confirmed my deficiency, my doctor recommended this easy-to-swallow pill, which has significantly improved my overall health, including my hair and bones.
8
We conducted a double-blind, placebo-controlled trial to evaluate the effects of an oral food supplement (OFS) on long COVID patients, particularly focusing on chronic inflammation and fatigue. The supplement included components like rosehip, propolis, royal jelly, and zinc, with vitamin C being a key ingredient.

Through our two-month study, which involved giving participants either the OFS or a placebo, we made some interesting observations. Notably, patients who took the OFS experienced a significant reduction in inflammatory markers, which are often linked to chronic fatigue syndrome. This included improvements in the neutrophil-to-lymphocyte and monocyte-to-lymphocyte ratios.

We also noted a substantial increase in vitamin D levels among those taking the supplement, which correlated with enhanced quality of life and decreased fatigue as measured by the fatigue severity scale. Our findings suggest that the combination of ingredients in the OFS, particularly its vitamin D content, can help alleviate some symptoms associated with long COVID, especially chronic fatigue.

However, since the supplement included multiple active ingredients, isolating the specific impact of vitamin D on chronic fatigue syndrome is challenging. Still, the overall results indicate positive changes for patients dealing with the lingering effects of COVID.
We conducted a thorough investigation into whether high-dose intermittent vitamin D3 could alleviate symptoms of chronic fatigue syndrome (CFS) and improve vascular health. This double-blind, randomized placebo-controlled trial involved patients meeting established criteria for CFS. Participants received either 100,000 units of vitamin D3 or a placebo every two months for six months.

Over the course of the study, we measured key outcomes such as arterial stiffness, blood pressure, cholesterol levels, and fatigue levels through various tests. Surprisingly, our findings showed that vitamin D3 treatment did not lead to any significant improvements in these areas. We observed only a slight increase in vitamin D levels in the treatment group, but this did not translate into better vascular health or reduced fatigue.

In conclusion, we honestly found that high-dose vitamin D3 did not offer any notable benefits for patients struggling with chronic fatigue syndrome. This study highlights the complexities of treating CFS and suggests that vitamin D3 may not be the solution some had hoped for.
8
Beta-glucan shows cognitive improvements
We conducted a randomized, double-blind, placebo-controlled trial to explore how yeast beta-glucan, along with multivitamins, affects individuals suffering from Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS). In our study, 65 participants received either beta-glucan combined with vitamins and zinc or a placebo for 36 weeks.

Interestingly, while our primary focus was on beta-glucan, which was shown to significantly improve cognitive fatigue, the role of vitamin D3 within this combination was not clearly established. This makes it challenging to directly assess the impact of vitamin D3 alone on chronic fatigue syndrome outcomes.

Overall, we discovered that beta-glucan supplementation could positively influence cognitive fatigue, offering promise for future research on nutritional support in ME/CFS patients. However, definitive conclusions about vitamin D3's effectiveness remain inconclusive due to the combined nature of the treatment.
9.5
Vitamin D treatment enhances alertness
We explored the impact of vitamin D treatment on a case of excessive daytime sleepiness (EDS), specifically in the context of chronic fatigue syndrome. A 28-year-old woman was found to have low levels of vitamin D after experiencing four months of overwhelming fatigue and sleepiness, despite being tested for sleep disorders.

After starting vitamin D supplementation, her condition improved remarkably within just two weeks. Along with a boost in alertness, her associated symptoms like muscle pain and headaches began to fade. By the end of the treatment, her score on the Epworth Sleepiness Scale, which measures daytime sleepiness, dropped significantly, indicating much better daytime function.

This case suggests that vitamin D may play a role in improving symptoms commonly linked to chronic fatigue syndrome. While more research is needed to fully understand the mechanisms behind this improvement, our findings open the door to potentially screening patients with chronic fatigue for vitamin D deficiency to expedite treatment.

References

  1. Noce A, Marrone G, Di Lauro M, Vita C, Montalto G, et al. Potential Anti-Inflammatory and Anti-Fatigue Effects of an Oral Food Supplement in Long COVID Patients. Pharmaceuticals (Basel). 2024;17. doi:10.3390/ph17040463
  2. 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
  3. McCarty DE. Resolution of hypersomnia following identification and treatment of vitamin d deficiency. J Clin Sleep Med. 2010;6:605.
  4. Lacasa M, Alegre-Martin J, Sentañes RS, Varela-Sende L, Jurek J, et al. Yeast Beta-Glucan Supplementation with Multivitamins Attenuates Cognitive Impairments in Individuals with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Randomized, Double-Blind, Placebo-Controlled Trial. Nutrients. 2023;15. doi:10.3390/nu15214504
  5. 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
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