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Functions enzymatic function Deficiency not known in humans Good Sources green, leafy vegetables nuts beans whole grains fruit tea Adequate Intakes (AI) Males (adults) 2.3 mg Females (adults) 1.8 mg Sufficient data to set RDA are unavailable Tolerable Upper Intake Levels (UL) Adults (19 to 50 yrs) 11 mg Intakes above UL may lead to negative health consequences. Supplementation Not necessary, not recommended