- For U.S. residents
| Life Stage Group | RDA (μg/day) |
| Infants | |
| 0-6 months | 1.7 |
| 7-12 months | 1.8 |
| Children | |
| 1-3 y | 2 |
| 4-8 y | 3 |
| Males | |
| 9-13 y | 4 |
| 14-18 y | 5 |
| 19-30 y | 5 |
| 31-50 y | 5 |
| 51-70 y | 5 |
| >70 y | 5 |
| Females | |
| 9-13 y | 4 |
| 14-18 y | 5 |
| 19-30 y | 5 |
| 31-50 y | 5 |
| 51-70 y | 5 |
| >70 y | 5 |
| Pregnancy | |
| £18 y | 6 |
| 19-30 y | 6 |
| 31-50 y | 6 |
| Lactating | |
| £18 y | 7 |
| 19-30 y | 7 |
| 31-50 y | 7 |