Copper is a cofactor for multiple essential enzymes: ceruloplasmin (iron transport — without it, iron can't be loaded onto transferrin), cytochrome c oxidase (mitochondrial energy production), lysyl oxidase (collagen and elastin cross-linking), and Cu/Zn superoxide dismutase (SOD1 — your primary intracellular antioxidant). When zinc is supplemented chronically, it induces metallothionein in gut cells, which binds copper preferentially and prevents its absorption. The gut cells eventually slough off, taking the bound copper with them. This is why zinc supplements should include small amounts of copper.
Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.