Males
| Age Group | RDA |
|---|---|
| 9–13 years | 2500 mg |
| 14–18 years | 3000 mg |
| 19–30 years | 3400 mg |
| 31–50 years | 3400 mg |
| 50+ years | 4700 mg |
Females
| Age Group | RDA |
|---|---|
| 9–13 years | 2300 mg |
| 14–18 years | 2300 mg |
| 19–30 years | 2600 mg |
| 31–50 years | 2600 mg |
| 50+ years | 4700 mg |
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