Quercetin acts as zinc ionophore
Quercetin increases cellular uptake of zinc by acting as a zinc ionophore, potentially enhancing zinc's antiviral and immune-supporting effects.
Effective combination for immune support.
Take together
Quercetin acts as zinc ionophore. Effective combination for immune support.
Take together
This interaction is rated “Synergy” by Formulate. Quercetin increases cellular uptake of zinc by acting as a zinc ionophore, potentially enhancing zinc's antiviral and immune-supporting effects.
Studies from our registry that mention quercetin or zinc. Each links to the primary source and the other Formulate pages citing it.
Mentions zinc · 2017
Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage
Hemilä H · JRSM Open
Meta-analysis of 7 RCTs (n=575) found zinc lozenges (≥75mg/day elemental zinc) shortened cold duration by ~33%, with no significant difference between acetate and gluconate forms.
Mentions quercetin · 2016
Quercetin, inflammation and immunity
Li Y, Yao J, Han C, et al. · Nutrients
Reviews mechanisms by which quercetin modulates inflammatory pathways (NF-κB, mast cell stabilization) and immune response — basis for its use in allergy, upper respiratory infections, and exercise-induced inflammation.
Mentions zinc · 2013
Oral zinc for the common cold (Cochrane Review)
Singh M, Das RR · Cochrane Database of Systematic Reviews
Cochrane review of 18 RCTs found zinc reduced common cold duration and severity in healthy adults when taken within 24 hours of symptom onset, though adverse effects (taste disturbance, nausea) were common.
Mentions quercetin · 2007
Quercetin reduces illness but not immune perturbations after intensive exercise
Nieman DC, Henson DA, Davis JM, et al. · Medicine and Science in Sports and Exercise
Double-blind RCT (n=40) in cyclists found 3 weeks of 1g/day quercetin reduced upper respiratory tract infection incidence during an intensive training block without altering immune markers.
Mentions zinc · 2005
Zinc-induced copper deficiency: a report of three cases initially recognized on bone marrow examination
Willis et al. · American Journal of Clinical Nutrition
Documented cases of copper deficiency from chronic high-dose zinc supplementation — supports the 1–2 mg copper pairing guideline.
Guide
Zinc Supplement Guide 2026: Evidence-Based & Ranked
Learn which zinc forms actually shorten colds, how dosing affects testosterone and copper balance, and who faces the highest deficiency risk.
Guide
Zinc for Immune Support: Timing and Form Matter More Than Dose
Zinc genuinely shortens colds, but only when taken correctly. Lozenges within 24 hours of first symptoms — not pills, not after you're already sick.
Other interactions to know
Zinc depletes copper over time
Zinc and iron compete for absorption
Calcium may reduce zinc absorption
Vitamin C regenerates quercetin
Quercetin enhances resveratrol bioavailability
Zinc needed for vitamin A metabolism
High-dose magnesium may slightly reduce zinc absorption
Check your full stack in the free interaction checker.
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Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.
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