Zinc Interactions
10 documented interactions — 7 warnings, 3 beneficial pairs.
View the full Zinc supplement guide →Interaction warnings
Zinc + calcium
moderateHigh-dose calcium (>600mg) can reduce zinc absorption
Zinc + dairy
moderateCalcium competes with zinc for absorption, potentially reducing zinc uptake.
Zinc + iron
moderateIron and zinc compete for absorption when taken together in high doses
Zinc + tetracycline
moderateZinc forms a chelate with tetracycline in the gastrointestinal tract, reducing absorption of the antibiotic by approximately 30 percent. The interaction also reduces zinc absorption.
Zinc + copper
moderateZinc and copper share an intestinal absorption pathway through metallothionein, so chronic high-dose zinc (50 mg or more daily) progressively depletes copper, causing anemia, neutropenia, and myelopathy. Co-supplementing copper at roughly 1 mg per 15 mg zinc preserves balance and allows long-term zinc use without copper deficiency.
Zinc + alcohol
moderateChronic alcohol use causes zinc deficiency through reduced intake, impaired absorption, increased urinary excretion, and altered zinc transporters (especially ZIP14). Zinc deficiency in turn worsens alcoholic liver disease by disrupting intestinal barrier function, increasing endotoxin leak, and amplifying hepatic oxidative stress.
Zinc + magnesium
moderateHigh-dose magnesium (>142mg) can interfere with zinc absorption
Beneficial pairs
Zinc + vitamin a
synergyZinc is required for the hepatic synthesis of retinol-binding protein, the carrier that mobilizes vitamin A from liver stores into circulation. Zinc deficiency lowers circulating retinol even when liver vitamin A is adequate, and combined supplementation outperforms either alone in deficient populations.
Zinc + vitamin c
synergyZinc supports innate and adaptive immunity (T-cell maturation, NK-cell function) and inhibits rhinovirus replication; vitamin C supports leukocyte function and skin/mucosal barriers as an antioxidant cofactor. Together they shorten the duration and reduce the severity of upper-respiratory infections.
Zinc + elderberry
synergyElderberry (Sambucus nigra) anthocyanins have antiviral activity against influenza and rhinovirus and reduce pro-inflammatory cytokine signaling; zinc inhibits viral replication and supports T-cell function. Together they shorten the duration and severity of upper-respiratory infections.
Related ingredients
Ingredients commonly checked alongside Zinc.