Quercetin
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A yellow plant pigment belonging to the flavonoid family, found naturally in onions, apples, and many other fruits and vegetables. As a supplement it is extracted and concentrated into capsule or tablet form.
Why it’s used
Taken to support general antioxidant intake and sometimes for seasonal allergy symptoms or exercise recovery.
What the evidence says
Human trial evidence is mixed and generally modest. Some small trials suggest effects on blood pressure or exercise performance, but results are inconsistent and many studies are small or industry-funded. There is no NIH Office of Dietary Supplements fact sheet dedicated to quercetin, and no established therapeutic dose has been confirmed.
Dose studied
500–1000 mg — typical daily doses used in small human trials.
Context
Trials investigating quercetin have used daily doses in roughly the 500 to 1000 mg range over several weeks, with considerable variability in outcomes measured and populations studied.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.