Quercetin
Quercetin is a natural plant flavonoid found in fruits, vegetables, and grains, commonly taken as a dietary supplement. It possesses antioxidant and anti-inflammatory properties, and is frequently used to support general wellness, immune function, and allergy relief.
Quercetin is a flavonoid supplement with antioxidant properties used for immune support and general wellness.
Key facts at a glance
- ATC
- unclassified
- RxNorm
- unknown
- Generic
- Quercetin
- Class
- unclassified
- Brands
- —
- Availability
- otc
- Pregnancy
- C
- Lactation
- caution
- Half-life (h)
- 2
- Onset (min)
- 30
- Duration (h)
- 6
- Routes
- oral
- Forms
- capsules, tablets, powder
- Regions
- United States, Canada, European Union, United Kingdom, Australia, Japan
- Monitoring
- liver function
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Commonly used as a dietary supplement for antioxidant support, immune system maintenance, and allergy symptom relief. Some individuals use it for cardiovascular health, exercise performance, and general anti-inflammatory support, though more research is needed to confirm efficacy for many uses.
Functions as a potent antioxidant, helping to neutralize free radicals and reduce oxidative stress in the body. It also exhibits anti-inflammatory properties by modulating immune cell activity and may help stabilize mast cells involved in allergic responses.
Available over-the-counter as a supplement rather than a prescription medication. Generally well-tolerated, but may interact with certain antibiotics, blood thinners, and chemotherapy drugs. Pregnant or breastfeeding individuals should consult a healthcare provider before use. Typical supplemental doses range from 500-1000mg daily, though optimal dosing is not well-established.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 28, 2026. · Read our editorial policy