Vitamin A, Selenium, Vitamin B12 and Iron: study protocols
5 study groups took Vitamin A together with Selenium, Vitamin B12 and Iron. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin A
5 study groups in 5 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, 60% of 5 study groups.
| Daily dose | Study groups |
|---|---|
| 250 mcg to 500 mcg | 2 |
| 500 mcg to 1 mg | 3 |
Dose per serving from research: Selenium
5 study groups in 5 studies say how much Selenium participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 50 mcg to 100 mcg, 60% of 5 study groups.
| Daily dose | Study groups |
|---|---|
| 10 mcg to 25 mcg | 1 |
| 25 mcg to 50 mcg | 1 |
| 50 mcg to 100 mcg | 3 |
Dose per serving from research: Vitamin B12
5 study groups in 5 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, 40% of 5 study groups.
| Daily dose | Study groups |
|---|---|
| 1 mcg or less | 1 |
| 1 mcg to 2.5 mcg | 1 |
| 2.5 mcg to 5 mcg | 2 |
| 5 mcg to 10 mcg | 0 |
| 10 mcg to 25 mcg | 0 |
| 25 mcg to 50 mcg | 0 |
| 50 mcg to 100 mcg | 1 |
Dose per serving from research: Iron
5 study groups in 5 studies say how much Iron participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 5 mg to 10 mg and 25 mg to 50 mg, 40% of 5 study groups each.
| Daily dose | Study groups |
|---|---|
| 5 mg to 10 mg | 2 |
| 10 mg to 25 mg | 1 |
| 25 mg to 50 mg | 2 |
Commonly used together
5 of 5 study groups took Vitamin A, Selenium, Vitamin B12 and Iron with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Iodine | 5 |
| Vitamin E | 5 |
| Zinc | 5 |
| Copper | 4 |
| Vitamin C | 4 |
| Folic Acid | 3 |
| Vitamin B6 | 3 |
| Vitamin D | 3 |
5 study groups