Vitamin A, Selenium and Vitamin C: study protocols
14 study groups took Vitamin A together with Selenium and Vitamin C. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin A
11 study groups in 11 studies say how much Vitamin A participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 250 mcg to 500 mcg and 500 mcg to 1 mg, 36% of 11 study groups each.
| Daily dose | Study groups |
|---|---|
| 100 mcg to 250 mcg | 2 |
| 250 mcg to 500 mcg | 4 |
| 500 mcg to 1 mg | 4 |
| 1 mg to 2.5 mg | 1 |
Dose per serving from research: Selenium
14 study groups in 12 studies say how much Selenium participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 100 mcg to 250 mcg, 36% of 14 study groups.
| Daily dose | Study groups |
|---|---|
| 2.5 mcg to 5 mcg | 2 |
| 5 mcg to 10 mcg | 0 |
| 10 mcg to 25 mcg | 1 |
| 25 mcg to 50 mcg | 1 |
| 50 mcg to 100 mcg | 3 |
| 100 mcg to 250 mcg | 5 |
| 250 mcg to 500 mcg | 2 |
Dose per serving from research: Vitamin C
14 study groups in 12 studies say how much Vitamin C participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 250 mg to 500 mg, 36% of 14 study groups.
| Daily dose | Study groups |
|---|---|
| 25 mg to 50 mg | 4 |
| 50 mg to 100 mg | 4 |
| 100 mg to 250 mg | 1 |
| 250 mg to 500 mg | 5 |
Commonly used together
14 of 14 study groups took Vitamin A, Selenium and Vitamin C with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Vitamin E | 9 |
| Zinc | 7 |
| Copper | 6 |
| Iron | 6 |
| Beta-Carotene | 5 |
| Iodine | 4 |
| Vitamin B12 | 4 |
| Folic Acid | 3 |
| Vitamin B6 | 3 |
| Vitamin D | 3 |
14 study groups