Vitamin A, Vitamin B12 and Zinc: study protocols
8 study groups took Vitamin A together with Vitamin B12 and Zinc. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin A
6 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: 500 mcg to 1 mg, 50% of 6 study groups.
| Daily dose | Study groups |
|---|---|
| 250 mcg to 500 mcg | 2 |
| 500 mcg to 1 mg | 3 |
| 1 mg to 2.5 mg | 1 |
Dose per serving from research: Vitamin B12
8 study groups in 8 studies say how much Vitamin B12 participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 2.5 mcg to 5 mcg, 50% of 8 study groups.
| Daily dose | Study groups |
|---|---|
| 0.5 mcg to 1 mcg | 3 |
| 1 mcg to 2.5 mcg | 1 |
| 2.5 mcg to 5 mcg | 4 |
Dose per serving from research: Zinc
8 study groups in 8 studies say how much Zinc participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 5 mg to 10 mg, 38% of 8 study groups.
| Daily dose | Study groups |
|---|---|
| 5 mg or less | 1 |
| 5 mg to 10 mg | 3 |
| 10 mg to 25 mg | 2 |
| 25 mg to 50 mg | 2 |
Commonly used together
8 of 8 study groups took Vitamin A, Vitamin B12 and Zinc 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 |
|---|---|
| Iron | 8 |
| Copper | 6 |
| Vitamin C | 6 |
| Vitamin E | 6 |
| Folic Acid | 5 |
| Iodine | 5 |
| Vitamin B6 | 5 |
| Vitamin D | 5 |
| Niacin | 3 |
| Selenium | 3 |
8 study groups