Magnesium: recommended daily intake
Reference values for magnesium across life-stage groups, from NIH Office of Dietary Supplements: Magnesium.
420mg
men
320mg
women
Adults 19–50.
| Life stage | RDA / AI | UL | EAR | AMDR |
|---|---|---|---|---|
| Infants 0–6 months | 30mg (AI) | - | - | - |
| Infants 7–12 months | 75mg (AI) | - | - | - |
| Children 1–3 years | 80mg (RDA) | 65mg | 65mg | - |
| Children 4–8 years | 130mg (RDA) | 110mg | 110mg | - |
| Males 9–13 years | 240mg (RDA) | 350mg | 200mg | - |
| Females 9–13 years | 240mg (RDA) | 350mg | 200mg | - |
| Males 14–18 years | 410mg (RDA) | - | 340mg | - |
| Females 14–18 years | 360mg (RDA) | - | 300mg | - |
| Adult males 19–50 | 420mg (RDA) | 350mg | 350mg | - |
| Adult females 19–50 | 320mg (RDA) | 350mg | 265mg | - |
| Adult males 51+ | 420mg (RDA) | 350mg | 350mg | - |
| Adult females 51+ | 320mg (RDA) | 350mg | 265mg | - |
| Pregnancy (19–30) | 350mg (RDA) | 350mg | 290mg | - |
| Lactation (19–30) | 310mg (RDA) | 350mg | 255mg | - |
Notes
- UL applies only to supplemental magnesium; food magnesium is safe at any intake level.
Source: NIH Office of Dietary Supplements: Magnesium (snapshot 2026-04-30)