Quercetin is a plant flavonoid with antioxidant, anti-inflammatory and senolytic properties. Complete guide to mechanism, clinical evidence and the quercetin + fisetin stack.
Quercetin is a plant flavonoid found in onions, apples and berries. It has published evidence for antioxidant and anti-inflammatory properties and emerging research for senolytic (senescent cell-clearing) activity. At supplement doses of 500-1000mg, it supports immune function, vascular health and may complement NMN/resveratrol longevity protocols.
Quercetin is a flavonoid polyphenol found in onions (particularly red onions), apples, berries, broccoli and green tea. It is one of the most consumed dietary flavonoids. At supplement doses, it demonstrates antioxidant, anti-inflammatory and immune-modulating properties in published research.
Emerging longevity research has identified quercetin as a potential senolytic agent — a compound that selectively clears senescent cells (dysfunctional aged cells that accumulate with age and secrete pro-inflammatory signals). Dasatinib + Quercetin (D+Q) is the most studied senolytic combination, though research in humans is still at an early stage.
Published meta-analyses have found quercetin supplementation associated with reduced duration and severity of upper respiratory tract infections, particularly in athletes during periods of heavy training stress.