Vitamin D: study protocols
366 study groups say how much Vitamin D participants took a day. These are the doses the studies gave. They are not a recommendation.
Dose per serving from products
10,203 products in our catalogue print how much Vitamin D a serving holds.
Most common: 10 mcg to 25 mcg, 35% of 10,203 products.
| Dose per serving | Products |
|---|---|
| 1 mcg or less | 434 |
| 1 mcg to 2.5 mcg | 364 |
| 2.5 mcg to 5 mcg | 666 |
| 5 mcg to 10 mcg | 1,944 |
| 10 mcg to 25 mcg | 3,536 |
| 25 mcg to 50 mcg | 1,524 |
| 50 mcg to 100 mcg | 704 |
| 100 mcg to 250 mcg | 756 |
| over 250 mcg | 275 |
Dose per serving from research
256 study groups in 148 studies say how much Vitamin D participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 500 IU to 1,000 IU, 31% of 256 study groups.
| Daily dose | Study groups |
|---|---|
| 250 IU or less | 9 |
| 250 IU to 500 IU | 62 |
| 500 IU to 1,000 IU | 79 |
| 1,000 IU to 2,500 IU | 59 |
| 2,500 IU to 5,000 IU | 26 |
| 5,000 IU to 10,000 IU | 13 |
| over 10,000 IU | 8 |
Commonly used together
130 of 366 study groups took Vitamin D with something else. Shown: what 3 or more different studies gave. The 10 most common of 13.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Calcium | 103 |
| Omega-3 Fatty Acids | 8 |
| Iron | 7 |
| Multivitamin | 6 |
| Folic Acid | 5 |
| Vitamin B12 | 5 |
| Whey Protein | 5 |
| Leucine | 4 |
| Riboflavin | 4 |
| Vitamin B6 | 4 |
366 study groups
| Study | |||
|---|---|---|---|
| Effect of calcifediol supplementation as add-on therapy on the immune repertoire in recipients of the ChAdOx1 nCoV-19 vaccine: A prospective open-label, placebo-controlled, clinical trial 2023 · calcifediol · Adults receiving ChAdOx1 nCoV-19 vaccine; age range and sex not specified | 50 mcg | 26 weeks | 262 |
| Improved Healing of Diabetic Foot Ulcers After High-dose Vitamin D: A Randomized Double-blinded Clinical Trial 2023 · high-dose vitamin D3 · People with diabetes and one or more foot ulcers lasting more than 6 weeks | 170 mcg | 48 weeks | 24 |
| Improved Healing of Diabetic Foot Ulcers After High-dose Vitamin D: A Randomized Double-blinded Clinical Trial 2023 · low-dose vitamin D3 · People with diabetes and one or more foot ulcers lasting more than 6 weeks | 20 mcg | 48 weeks | 24 |
| Effects of Vitamin D on Cardiac Function in Patients With Chronic HF: The VINDICATE Study 2016 · Vitamin D · Adults with vitamin D-deficient chronic heart failure due to left ventricular systolic dysfunction; stable NYHA class II or III symptoms | 100 mcg | 1 year | 80 |
| Vitamin D and Marine n-3 Fatty Acids for Autoimmune Disease Prevention: Outcomes Two Years After Completion of a Double-Blind, Placebo-Controlled Trial 2024 · Vitamin D · Men aged 50 years or older and women aged 55 years or older, recruited from the United States; prevention population without the trial's excluded serious illnesses | 2,000 IU | 1936 days | 12,927 |
| Active vitamin D treatment in the prevention of sarcopenia in adults with prediabetes (DPVD ancillary study): a randomised controlled trial 2024 · eldecalcitol group · Adults with prediabetes; mean age 60.8 years; both sexes | 0.75 mcg | 1059 days | 548 |
| Does antenatal cholecalciferol supplementation affect the mode or timing of delivery? Post hoc analyses of the MAVIDOS randomized controlled trial 2023 · Cholecalciferol · Pregnant women aged over 18 years with singleton pregnancies and baseline 25(OH)D of 25–100 nmol/l | 1,000 IU | — | 479 |
| Calcium and vitamin D supplementation and increased risk of serrated polyps: results from a randomised clinical trial 2019 · vitamin D alone · Adults aged 45–75 with at least one adenomatous polyp detected and removed within the preceding 4 months | 1,000 IU | 5 years | 420 |
| Maternal antenatal vitamin D supplementation and offspring risk of atopic eczema in the first 4 years of life: evidence from a randomized controlled trial 2022 · Cholecalciferol (1000 IU daily) · Pregnant women aged over 18 years with a singleton pregnancy under 17 weeks’ gestation and baseline serum 25(OH)D of 25–100 nmol/L | 1,000 IU | — | 352 |
| Vitamin D3 Supplementation at 5000 IU Daily for the Prevention of Influenza-like Illness in Healthcare Workers: A Pragmatic Randomized Clinical Trial 2022 · vitamin D3 supplementation intervention group · Healthcare workers aged 18 years or older; no specific diagnosis or deficiency required | 5,000 IU | 270 days | 299 |