4-8 8 mg; 9-13 12 mg; 14 and older males 16 mg, females 14 mg unless pregnant or breastfeeding which raises the requirement to 18 mg. | 4-8 8 mg; 9-13 12 mg; 14 and older males 16 mg, females 14 mg unless pregnant or breastfeeding which raises the requirement to 18 mg. |