Strong evidenceantioxidant
Quercetin for Frequent Colds
Exhibits antiviral properties against respiratory viruses, acts as zinc ionophore, modulates immune cell function.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
Research source
SourceDavis JM et al. · Am J Physiol 2008How much to take
500–1000 mg
Prophylactic use may reduce incidence. Works synergistically with zinc.