Is Copper supplement Safe with Zinc supplement?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Monitor total zinc dose and copper status when clinically appropriate.
Why this interaction occurs
Long-term zinc supplementation at total daily doses ≥50 mg/day induces metallothionein in intestinal cells, which binds copper with higher affinity than zinc, sequestering copper in enterocytes and blocking systemic absorption. The issue is cumulative total daily zinc dose and duration, not timing or spacing of individual doses. Chronic zinc excess is a well-documented cause of acquired copper deficiency, leading to anemia, neutropenia, and neurological deficits.
Evidence
Evidence level: strong.
Data source
Duncan et al., British J Clinical Pharmacology 2023; Fan et al., Yamada's GI Textbook 2022; Saly et al., NEJM 2017
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 Copper supplement interactions → · All Zinc supplement interactions →
Already checked this one — check your whole list
Educational only — not medical advice.
Always confirm with your doctor or pharmacist.