Quercetin facilitates zinc uptake into cells by acting as a zinc ionophore — a molecule that complexes with zinc ions and transports them across lipid membranes. Intracellular zinc at concentrations ≥50 μM inhibits viral RNA-dependent RNA polymerase (RdRp), the enzyme essential for coronavirus, influenza, and rhinovirus replication.

Should I take quercetin and zinc together?

Yes, for ionophore activity, quercetin and zinc should be co-administered. Most practitioners take quercetin with meals and add zinc at the same time. Zinc absorption is mildly inhibited by phytates in plant-heavy meals; taking with a lighter meal improves absorption.

How much zinc do I need for quercetin ionophore activity?

The intracellular zinc concentration required for RdRp inhibition (>50 μM) exceeds what standard dietary zinc provides. Supplemental zinc (15–25 mg elemental/day) combined with quercetin's ionophore activity may achieve intracellular concentrations in the therapeutic range.