Proof that Vitamin D Works
Vitamin D prevents or treats 99 health problems
ADHD, Alcoholic Liver Cirrhosis, ALS, Alzheimer's, Antibiotic Use in Seniors, Asthma, Autism, Autoimmune Diseases, Back pain, Blood Cell Cancer, Breast Cancer, Cardiovascular, Cholesterol, Chronic Hives, Chronic Kidney Disease, Cluster Headaches, Congestive Heart Failure (Infants), COPD, Crohn's Disease, C-Section and Pregnancy Risks, Cystic Fibrosis, Dengue Fever, Depression, Diabetes, Diabetic Neuropathy, Eczema, Epilepsy, Falls, Fatigue, Fatty Liver (Child), Fibromyalgia, Gestational Diabetes, Gingivitis, Growing Pains, Hay Fever, Heart Attack, Hemodialysis, Hepatitis-C, Hip Fractures, Hypertension, ICU survival, Influenza, Irritable Bowel Syndrome, Ischemic Stroke, Knee Osteoarthritis, Leg Ulcers, Long-COVID, Low Birth Weight, Lupus, Male Infertility, Menstrual Pain, Metabolic Syndrome, Middle Ear Infection (Infants), Mite Allergy, Multiple Sclerosis, Non-Alcoholic Fatty Liver Disease, Osteoarthritis, Parkinson's Disease, Perinatal Depression, Pneumonia (Ventilator-associated), Poor Sleep, PreDiabetes, Preeclampsia, Pre-term Birth, Prostate Cancer, Psoriasis, Quality of Life, Raynaud's Pain, Respiratory Tract Infection, Restless Leg Syndrome, Rheumatoid Arthritis, Rickets, Sarcopenia, Sepsis, Short Neonates, Sickle Cell, Stronger Senior Muscles, Survive ICU, TB, Tonsillitis, Trauma Death, Traumatic Brain Injury, Tuberculosis, Ulcerative Colitis, Urinary Tract Infection, Vaginosis, Vertigo, Warts, Weight Loss
Reminder: Translate icon in the upper right selects a different language
Click on ===underlined=== items for details
| Health Problem | Treat Prevent |
Reduction by Vit D | RCT = Randomized Controlled Trial ✻ = link to additional RCT CT = Clinical Trial |
|
| Hypertension | T P | 149 to 142 mm Hg HT risk reduced 10X |
RCT ✻ ✻ , 2400 IU. 100,000 IU* When Vitamin D > 40 ng |
|
| Cardiovascular after attack | T | 32 % fewer deaths | CT 1000 IU | |
| [#T1_Diabetes | Diabetes Type 1](/pages/diabetes/) | P | 85 % | 12,000 kids, 2000 IU |
| Diabetes Type 2 | T | 62 % | RCT ✻ CRP reduction, 4000 IU Injection is far better - |
|
| Back Pain | T | [95 % | ||
| reduced 50%](/pages/tiki-download-filephp/) | 5000/10000 IU 60,000 IU weekly |
|||
| Influenza | P | 90 % | RCT |
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| Falls | P | 50% | RCT, 100,000 IU monthly RCT with Meals on Wheels 2016 |
|
| Hip Fractures | P | 30 % | RCT ✻ 800 IU | |
| Rickets | P | 98 % | Turkey, 400 IU NOT RCT, given to all children | |
| Raynaud's Syndrome | T | 40 % | RCT, visual scale, 20000 IU Avg | |
| Menstrual pain | P | 76 % | RCT, 7000 IU Avg, 70% reduction 2018 PMS reduced by half |
|
| Pregnancy risks | P | 50 % | RCT, 4000 IU | |
| C-section, unplanned | P | 50 % | RCT, 4000 IU, small study | |
| Low birth weight | P | 60 % | RCT ✻ 1000 IU of D2 | |
| TB | P | 60 % | RCT, 800 IU | |
| Breast Cancer | P | [Tiki-index. PHP? page_id=931] | RCT, 1100 IU (2007) | |
| Rheumatoid Arthritis pain | T | 40 % | RCT, 500 IU, added to prescription | |
| Cystic Fibrosis | T | 75 % 2nd study improved |
RCT, pilot 4X fewer deaths 250,000 IU RCT, pilot 8,200 IU |
|
| Chronic Kidney | T | 90 to 70 PTH | RCT, 3500 IU, | |
| Respiratory Tract Infection | P | 63 % | 3 RCT, 4000 IU 1 year 2nd 2000/800 IU 20,000 IU weekly |
|
| [tiki-browsecategories. PHP? parentId=31&sort;mode=created_desc] | T T |
[Tiki-index. PHP? page_id=3285] Pain reduced |
Loading then 100,000 IU monthly, [Tiki-index. PHP? page_id=3619] |
|
| Sickle Cell | T | Less pain |
RCT, up to 100,000 IU/week | |
| Leg ulcer healing | T | 4X faster | RCT, 50,0000 IU/week, small study | |
| Traumatic Brain Injury | T | [Tiki-index. PHP? page_id=3640] | RCT, 20,0000 IU/day with progesterone | |
| Parkinson's Disease | T | Stabilized | RCT, 1200 IU/day | |
| Multiple Sclerosis | P T |
68% [Tiki-index. PHP? page_id=5279] |
RCT, 7100 IU prevent pre-MS ==> MS 20,000 to 140,000 IU/day |
|
| Congestive Heart Failure | T | [Tiki-index. PHP? page_id=2441] | RCT, 1000 IU infants ([Tiki-index. PHP? page_id=4138]) | |
| Middle Ear Infection | P | [Tiki-index. PHP? page_id=4133] | RCT, 1000 IU infants | |
| Gingivitis | T | 88 % | RCT, 2000 IU | |
| [Tiki-index. PHP? page_id=28] | T | [Tiki-index. PHP? page_id=4645] | RCT, 4000 IU | |
| Antibiotic use when >70y | T | [Tiki-index. PHP? page_id=4646] | RCT, 60,000 IU monthly | |
| Infants taller | Benefit | [Tiki-index. PHP? page_id=4668] | RCT, 50,000 IU weekly, for 8 weeks while pregnant |
|
| Gestational Diabetes | T | [Tiki-index. PHP? page_id=4676] | RCT, 2 doses of 50,000 IU | |
| After Heart Attack | T | [Tiki-index. PHP? page_id=4695] | RCT, 800,000 IU one time | |
| [tiki-browsecategories. PHP? parentId=43&sort;mode=created_desc] | T | [Tiki-index. PHP? page_id=2989] | RCT, 4000 IU (2012) | |
| Asthma | P T | [Tiki-index. PHP? page_id=4745] | RCT, 60K IU/month; RCT 50K IU/week Need good D at 4 weeks into preg. |
|
| [tiki-browsecategories. PHP? parentId=43&sort;mode=created_desc] | T | [Tiki-index. PHP? page_id=4757] | RCT 300,000 IU injection RCT 1500 IU helped Prozac RCT 50,000 IU weekly, elderly |
|
| [tiki-browsecategories. PHP? parentId=109&sort;mode=created_desc] | P | [Tiki-index. PHP? page_id=4845] | RCT, 5,000 IU | |
| [Tiki-index. PHP? page_id=383] | T | [Tiki-index. PHP? page_id=5005] | RCT, 30-48 ng RCT 50K IU/week |
|
| Hives, Chronic | T | [Tiki-index. PHP? page_id=5053] | RCT, 4000 IU added | |
| Cholesterol | T | Reduced 4 mg | RCT, 400 IU + Ca | |
| Weight Loss | T | [Tiki-index. PHP? page_id=5166] | RCT, 2000 IU +diet +exercise | |
| Gestational Diabetes | P | 40% | RCT ✻ , 5,000 IU | |
| [Tiki-index. PHP? page_id=5151] | T | [Tiki-index. PHP? page_id=4724] | CT, 50,000 IU weekly |
|
| [Tiki-index. PHP? page_id=1433] | T | [Tiki-index. PHP? page_id=5393] | RCT >42 mg of vitamin D | |
| [Tiki-index. PHP? page_id=3924] | T | [Tiki-index. PHP? page_id=5387] | CT, 4,000 IU in daily bread | |
| Death of Critically Ill Patients |
T | 20% increase in survivability | RCT 540 K IU loading than 90K monthly | |
| Restless Leg Syndrome | T | Score 26 ==> 10 | CT, Vitamin D dose size not stated in abstract |
|
| Hepatitis-C | T | Aided normal drugs | RCT 2.000 IU | |
| Crohn's disease | T | improved when > 30 ng 2nd study fewer relapses |
RCT 2,000 IU 10,000 IU RCT |
|
| Pre-term birth | P | 2.5X decrease, also: fewer c-section & better Apgar |
RCT 2,000 IU India | |
| Cluster headaches | T | CH eliminated in 60% | 10,000 IU, Mg, Omega-3, etc | |
| Autism | T | 80% improved | CT 300 IU/kg/day for 3 months | |
| PreDiabetes | T | ~20% reduced | RCT 60,000 IU/month | |
| Weight loss:%%%Overweight and Obese | T | 12 lbs in 6 months | RCT 100,000 IU/month | |
| Sarcopenia = muscle loss | T | 27% increase | RCT 1,000 IU | |
| Growing Pains | T | 60% decrease | ~100,000 IU/month - NOT RCT 2nd study, similar results |
|
| Osteoarthritis pain | T | 60% decrease | 50,000 IU/weekly - NOT RCT | |
| ALS | T | helped | 2,000 IU - NOT RCT, given to all | |
| Vertigo | T | 3X reduction if raised > 10ng | 600,000 IU load, then maint. NOT RCT, given to all |
|
| Warts | T | 80% eliminated injection | NOT RCT 60,000 IU/injection |
|
| Metabolic Syndrome | P | reduced 44% when VitD increased by 30 ng |
NOT RCT, given to all | |
| Hay fever | P | reduced 48% | RCT 1,000 IU for 30 days | |
| Preeclampsia | P | Recurrance cut in half |
50,000 IU every 2 weeks 4,000 IU daily |
|
| Blood cell cancer Multiple Myeloma |
T | Survival 90% vs 50% | 10,000 IU/week NOT RCT, given to all |
|
| Irritable Bowel Syndrome | T | Reduced | 3,000 IU spray RCT | |
| Urinary Tract Infection | P | 50% reduction | RCT 20,000 IU weekly | |
| Mite Allergy | P | 5X reduction | RCT 2,000 IU preg, 800 IU child | |
| Perinatal depression (depression near birth) |
T | 50% reduction | RCT 2,000 IU for just a few weeks | |
| Vaginosis | T | 10X reduction | RCT 2,000 IU | |
| Eczema | T | Reduced | 2 RCT 1,600 IU | |
| Non-Alcoholic %%%Fatty Liver Disease | T | Reduced | RCT 20,000 IU weekly | |
| Knee Osteoartiritis | T | Pain Reduced | RCT 60,000 IU monthly after loading dose | |
| Tuberculosis | T | Faster Recovery | RCT single 450,000 IU dose | |
| Stroke - Ischemic | T | Faster Recovery | RCT single 600,000 IU injection ~~#F00:_ RCT_ ~~ single 300,000 IU injection |
|
| Sepsis | T | Reduce ICU and Hospital length of stay by 7 days each |
RCT 400,000 IU | |
| Trauma deaths | T | 50% fewer deaths | Vitamin D & Glutamine NOT RCT, given to all |
|
| Hemodialysis patients | T | helped | 50,000 IU weekly NOT RCT, given to all | |
| Fatty liver - child | T | 2 X reduction | RCT Vitamin D & DHA | |
| Fatigue | T | Reduced | 100,000 IU single dose NOT RCT, given to all |
|
| Sleep Disorders | T | Nicely treated | RCT 50.000 IU bi-weekly | |
| Pneumonia (Ventilator-associated) |
T | ~~#F00:_ RCT_ ~~ ~hs~ Death rate cut in half | 300,000 IU injection | |
| Infertile males | T | birth rate doubled | RCT 300,000 IU + maint | |
| Waist size | T | Waist size reduced 3 cm | 100,000 IU loading + maint for 6 months for those with Metabolic Syndrome NOT RCT, given to all |
|
| Attention Deficient%%% Hyperactivity Disorder | T | Reduced Reduced |
RCT 3,000 IU for 12 weeks RCT 50,000 IU weekly |
|
| Alcoholic liver cirrhosis | T | improved survival | 1,000 IU of vitamin D NOT RCT | |
| Diabetic nephropathy | T | Reduced HOMA-IR, FRS | RCT 50,000 IU weekly | |
| Ulcerative Colitis | T | Reduced 60% | RCT 50,000 IU nano daily for a week | |
| Obese weight loss | T | Lost 3X more pounds | $10 of Vitamin D added to calorie restriction & walking |
|
| Endometriosis | T | Nicely treated | RCT 50.000 IU bi-weekly | |
| Diabetic Wounds | T | 4X more likely to heal | RCT 6,400 daily | |
| Alzheimer's | T | Often reverse | Each person gets a different amount of Vit D, Omega-3, B12, Iron, etc |
|
| Autoimmune | P | Decrease 30% | RCT Vit D + Omega-3 | |
| Smoking | T | reduce problems | RCT 50,000 bi-weekly | |
| Tonsillitis | T | Virtually eliminated | RCT 50,000 weekly | |
| Epilepsy | T | Helped 6 ways | NOT RCT, given to children & adults | |
| Dengue Fever | T P | |||
| Psoriasis | T | cured | 30,000 to 60,000 IU | |
| ICU Survival | T | 2X longer | 500,000 IU | |
| Long-COVID | T | 60,000 IU weekly |
Most proofs are RCT (Randomized Controlled Trials), where not even the doctor knows who gets it vitamin D
2 are meta-analyses of multiple RCTs
Vitamin D was given to ALL infants in the entire country (Rickets) - not an RCT
In several studies, researchers felt that it was unethical not to give vitamin D to everyone
In some studies, the dose size varied with the needs of the person (overweight, etc)
In some studies, the COFACTORS were adjusted to the needs of the patients
- Curing requires the dose size and cofactors to be adjusted to the needs of each patient.
Many Clinical Trials have not found a benefit because of one or more of the following failures:
- Fails to use a [Tiki-index. PHP? pageid=766] (often < 1,100 IU)
- The Even larger dose needed if: 1) obese, 2) [Tiki-index. PHP? pageid=745], 3) sick (many diseases consume lots of vitamin D)
Fails to have given vitamin D for a long enough time (a few RCT lasted less than 5 weeks)
Fails to have given Vitamin D frequently enough. [Tiki-index. PHP? page_id=2475] - and at least weekly for D2
- Note: Infrequent dosing also causes unbalancing of the body's chemistry
Fails to provide a [Tiki-index. PHP? page_id=326], or had too short a duration to restore the vitamin D levels
Fails to use D3 form, instead uses the [Tiki-index. PHP? page_id=2138]
Fails to have a healthy range of [Tiki-index. PHP? pageid=1446] or other important [Tiki-index. PHP? pageid=1270] (especially for bone-related trials
- Also, differences in Magnesium can result in 30% change in response to vitamin D
- Magnesium is dependent on water, food, supplements
Fails to notice the pre-existing vitamin D levels - only those who are low will likely show a benefit
Fails to notice how/when the vitamin D was taken (which can change the response by as much as 2X)
Fails to report on compliance (in one case 40% of the participants did not take the supplements consistently)
Many Meta-Analyses also do not find a benefit because one or more of the above failures
In addition, many [tiki-browsecategories. PHP? parentId=82&sort;mode=created_desc] average together ALL of the trials
Imagine a story about a meta-analysis of aspirin (which has never been done)
There would be scores of RCT for aspirin not working with 3 mg doses
There would be a many RCT of aspirin not working with 30 mg doses
There would be a few studies of aspirin WORKING with 300+ mg doses
There would be many studies of small amounts of Willow bark (Vitamin D2 instead of Vitamin D3)
Then there would be a meta-analysis of aspirin and Willow Bark
- That meta-analysis would conclude that aspirin and Willow bark do not work.
See also VitaminDWiki: Random Controlled Trials with vitamin D intervention
Intervention - Vitamin D Interventions
- Note: It sorts the interventions by health problem as well as by date
- 29866 Vitamin D clinical trials as of Jan 2025 : Nutrition Disorders 621, Vitamin D Deficiency 619, Malnutrition 601, Avitaminosis 586, Deficiency Diseases 583, Metabolic Diseases 489, Musculoskeletal Diseases 362, Bone Diseases 317. Bone Diseases, Metabolic 282, Endocrine System Diseases 241. Osteoporosis 209, Immune System Diseases 190, Kidney Diseases 168, Communicable Diseases 164. Infection etc.
- Note: It sorts the interventions by health problem as well as by date
137 health problems associated with low vitamin D – meta-meta-analysis April 2014
Intervention - 2-30 days items
More intervention trials for Vitamin D than for the TOTAL of Vitamins A + C + K combined
Vitamin D = 2199 , Others = 1803 Vitamin A 702 + Vitamin C 768 + Vitamin K 333 as of Aug 2020
See also VitaminDWiki
Is it ethical to not give vitamin D in osteoporosis trials– NEJM Sept 2010
Some Vitamin D RCT are not being created because the researchers do not want to deprive the benefits to half of the patients
Some Vitamin D RCT cannot be started because too many candidates are already taking vitamin D
List of all categories of Vitamin D Information and number of items in each
List of all Overviews of Vitamin D items along with related searches

CLICK ON chart for more information and translation
Vitamin D is especially needed during pregnancy
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Also, The Vitamin D Receptor limits the amount of Vitamin D in the blood actually gets to the tissue
The risk of 48+ diseases at least double with poor Vitamin D Receptor
Short URL = is.gd/dproof