Is Zinc supplement Safe with Calcium supplement?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid taking large calcium doses (>500 mg) simultaneously with zinc. Space supplements by at least 1 hour. Patients on long-term calcium therapy should monitor zinc status periodically.
Why this interaction occurs
High calcium intake has been shown to decrease zinc absorption in human studies, possibly through competitive inhibition at intestinal absorption sites or by forming insoluble zinc-calcium complexes in the gut lumen at higher pH levels.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 620,762 reports mentioning Calcium supplement. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Calcium 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 Zinc supplement interactions → · All Calcium supplement interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.