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