OtherNo.065
Quercetin
Antioxidant, allergy & immune support (marketed).
Typical / RDA500–1,000 mg
Upper limitNot established
EvidenceLimited
How to take it
Timing With a mealFood With fatForm + Bromelain / vit C
What to know
A plant flavonoid found in onions and apples, marketed for allergies and immunity. Absorption is poor and human evidence is preliminary.
Interactions & cautions
- May affect metabolism of some drugs at high doses.
Do you actually need it?
Promising antioxidant on paper; evidence is early.
Questions people ask about quercetin
- Does Quercetin Help with Seasonal Allergies?Quercetin is marketed for seasonal allergies, but human evidence is preliminary. While generally considered safe, its absorption is poor, and more research is needed.
- Do you need both resveratrol and quercetin for antioxidant benefits?Probably not. Both resveratrol and quercetin are marketed as antioxidants, but human evidence for significant benefits from either is limited, making combination largely redundant.
Reference values: NIH Office of Dietary Supplements, adult general population. Educational information only — not medical advice. Confirm with a healthcare professional.