Vitamin A, Vitamin D and Vitamin C: study protocols
6 study groups took Vitamin A together with Vitamin D and Vitamin C. These are the doses the studies gave. They are not a recommendation.
Fewer than 5 study groups in one unit match, too few to draw the chart.
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 |
Dose per serving from research: Vitamin C
6 study groups in 6 studies say how much Vitamin C participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 25 mg to 50 mg and 50 mg to 100 mg, 50% of 6 study groups each.
| Daily dose | Study groups |
|---|---|
| 25 mg to 50 mg | 3 |
| 50 mg to 100 mg | 3 |
Commonly used together
6 of 6 study groups took Vitamin A, Vitamin D and Vitamin C with something else. Shown: what 3 or more different studies gave. The 10 most common of 12.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Copper | 6 |
| Iron | 6 |
| Vitamin B12 | 6 |
| Vitamin E | 6 |
| Zinc | 6 |
| Iodine | 5 |
| Vitamin B6 | 5 |
| Niacin | 4 |
| Folate | 3 |
| Folic Acid | 3 |
6 study groups