Vitamin A and Vitamin D: study protocols
11 study groups took Vitamin A together with Vitamin D. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin A
7 study groups in 6 studies say how much Vitamin A participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 1,000 IU to 2,500 IU, 57% of 7 study groups.
| Daily dose | Study groups |
|---|---|
| 500 IU to 1,000 IU | 3 |
| 1,000 IU to 2,500 IU | 4 |
Dose per serving from research: Vitamin D
6 study groups in 6 studies say how much Vitamin D participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 2.5 mcg to 5 mcg, 83% of 6 study groups.
| Daily dose | Study groups |
|---|---|
| 2.5 mcg to 5 mcg | 5 |
| 5 mcg to 10 mcg | 1 |
Commonly used together
7 of 11 study groups took Vitamin A and Vitamin D with something else. Shown: what 3 or more different studies gave. The 10 most common of 15.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Vitamin B12 | 7 |
| Zinc | 7 |
| Copper | 6 |
| Iron | 6 |
| Vitamin B6 | 6 |
| Vitamin C | 6 |
| Vitamin E | 6 |
| Iodine | 5 |
| Niacin | 4 |
| Folate | 3 |
11 study groups