Quercetin

What it does

Quercetin is a flavonoid in onions, apples, and capers. It gained longevity attention paired with dasatinib in early senolytic trials; on its own, the human evidence is thin.

What the research says

• May support senolytic protocols in combination

  Evidence: emerging. Early human data is for the dasatinib combination, not quercetin alone.

• Antioxidant and anti-inflammatory effects

  Evidence: moderate. Well characterized in vitro; clinical significance unclear.

• May add knee-extension force during resistance training

  Evidence: emerging. Older adults taking quercetin during 6 weeks of resistance training produced more knee-muscle force, but did not improve functional tasks like chair-rise. Small study.

DRAFT: interesting only in combination contexts; standalone human data is weak.

What the experts say

Every position links to its source. We include skeptics alongside supporters.

• David Sinclair

  Source, 2026-10-13 Previously took 500 mg quercetin with fisetin daily as a senolytic; stated on his Lifespan podcast that he takes fisetin and quercetin, though he has since favored fisetin.

• James Kirkland

  “I want to emphasize that no one should take these drugs. This research is only beginning.”

  Source, 2019-12-31 Ran the first human senolytic trial (dasatinib plus quercetin) in idiopathic pulmonary fibrosis patients; all 14 showed improved physical function, but he stresses it was a small safety trial and nobody should take these drugs off-label.

Is it worth it?

DRAFT: cheap, but the standalone case is thin.