← The FormularyLong gameQuercetin
Also known as Quercetin dihydrateThe flavonoid in every onion and every longevity stack.
Quercetin has been studied for decades across inflammation, immunity, allergy and exercise, and the honest summary is that nothing has stuck hard enough to authorise. European regulators assessed the claims and rejected them. It is in this formula because it is a standard companion to NAD+ in the longevity literature, not because we can tell you what it will do for you.
A plant pigment found in onions, apples and capers, extracted here from Japanese pagoda tree flower buds.
Flavonoids like quercetin donate electrons to unstable molecules, which is the mechanism behind every antioxidant story you have read. Mechanism is not outcome, and the gap between the two is where most supplement marketing lives.
It behaves as an antioxidant in a test tube. What it does in a person, at this dose, is not settled enough to claim.
Anyone taking it as part of a cellular formula rather than on its own merits.
250 mg daily, with food. Absorption is poor on an empty stomach.
Nothing perceptible.
Grade C. Extensive preclinical work, inconsistent human trials, no authorised claim. The rejection was on evidence, not safety.
Read the labelInterferes with the liver enzymes and transport proteins that move many prescription drugs — at supplemental doses, drug levels can shift in either direction. Check with a pharmacist.
Evidence grades describe how well an ingredient is studied — A well-supported, C emerging — not a promise of results. Educational, not medical advice. Doses are typical ranges; follow the label on the product.