Research library / Quercetin

Quercetin supplementation and upper respiratory tract infection: A randomized community clinical trial

S Heinz, D Henson, M Austin, F Jin, D Nieman. Pharmacological Research. 2010.

Published 2026-10-15Sources checked 2026-10-151 sourceEverstack research teamHow we work

In plain language

Quercetin 500 or 1,000 mg/day did not reduce upper respiratory infections over 12 weeks.

Limits

Self-reported symptoms.

Source

doi.org/10.1016/j.phrs.2010.05.001 · PubMed 20478383 · Free full text

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