The major problem with excess zinc consumption is copper deficiency. A tolerable upper intake level (UL) has been established to prevent a reduction in the antioxidant (copper-zinc superoxide dismutase) activity in red blood cells. This UL includes zinc from dietary, fortified, and supplementary sources added together.
The UL for infants is 4 to 5 mg. For children one to three years of age, the UL is 7 mg. For children four to eight years of age, the UL is 12 mg. For children nine to thirteen years of age, the UL is 23 mg. For adolescents, the UL is 34 mg. For adults, the UL is 40 mg.
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