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.
Reference values: NIH Office of Dietary Supplements, adult general population. Educational information only — not medical advice. Confirm with a healthcare professional.