Quercetin for Allergy Relief
Quercetin stabilizes mast cells in vitro and reduced nasal symptoms in small Japanese RCTs of pollinosis. Effects are modest and bioavailability is poor without phytosome formulations.
Overview
Verdict
Small RCTs show reduced nasal symptoms; bioavailability limits real-world effect.
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 500 mg twice daily, started 4–6 weeks before allergy season.
- Expected timeframe
- 2–4 weeks of loading; assess across the season.
Protocol
- form
- Plain quercetin aglycone is poorly absorbed - bioavailability under 10%. Enhanced forms including quercetin phytosome (Quercefit), enzymatically modified isoquercitrin, or quercetin taken with bromelain or vitamin C achieve substantially higher plasma levels at lower doses
- duration
- Start 2-4 weeks before expected exposure and continue through the season
- co factor
- Take with food containing fat. Evidence is mixed. Quercetin is a well-characterised mast cell stabiliser in vitro, inhibiting histamine release from basophils and mast cells, and suppressing IL-4, IL-8 and leukotriene production - the mechanism is genuinely relevant to allergy. Human trials are sparse: a small Japanese trial of enzymatically modified isoquercitrin in Japanese cedar pollinosis reported reduced ocular symptoms, and some studies in allergic rhinitis show modest benefit, but there is no adequately powered trial comparable to those behind antihistamines.
- titration
- Increase to 500 mg twice daily; most allergy protocols use 500-1,000 mg/day in divided doses
- starting dose
- 500 mg once daily with a fat-containing meal
Evidence
No studies are yet linked to both Quercetin and Allergy Relief.
Safety
Caveats
Poor oral bioavailability; phytosome forms absorb better. May interact with some antibiotics and cyclosporine.
Less likely to help if
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.