Is Calcium supplement Safe with Zinc supplement?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid taking high-dose calcium (>1000 mg) and zinc at the same time. Separate by at least 1 hour. Dietary calcium at normal food intake levels poses minimal risk.
Why this interaction occurs
High-dose calcium supplementation can inhibit zinc absorption, potentially through competition at intestinal transporter sites and precipitation in alkaline intestinal pH. The interaction is dose-dependent and more relevant with supplemental rather than dietary calcium.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 91,121 reports mentioning Zinc supplement. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Zinc supplement + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Calcium supplement interactions → · All Zinc supplement interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.