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Zinc Sulfate

Low concern

Zinc sulfate is an authorized zinc source for nutritional fortification with good bioavailability. Excess zinc intake (>40 mg/day for adults) can interfere with copper absorption and cause GI symptoms.

Found in

1,961 products

What it is

Inorganic zinc salt (ZnSO4) used as a nutrient fortificant and dietary supplement.

Mineral fortificant providing bioavailable zinc.

Why it's flagged

copper deficiency at high chronic intake
GI upset on empty stomach

What regulators actually say

"Zinc sulfate is one of the forms of zinc found in dietary supplements. The Tolerable Upper Intake Level (UL) for zinc is 40 mg/day for adults."

NIH Office of Dietary Supplements - Zinc — ods.od.nih.gov

Regulatory status

United States — FDA

GRAS as a nutrient under 21 CFR 182.5997 / 182.8997

European Union — EFSA

Authorized zinc source for food fortification (Reg. (EC) 1925/2006)

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