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ingestible · for hay fever (seasonal allergies)

Quercetin

Reviewed by the Nimbera editorial team · Last updated May 2026

A 2016 review in Molecules found quercetin stabilizes mast cells and inhibits histamine release, reducing allergic rhinitis symptoms in multiple in vitro and animal studies with supporting human pilot data.$15-$35 per month

How to use

Take 500 mg twice daily with meals, starting 4-6 weeks before allergy season. Pair with bromelain (100-200 mg) to improve absorption.

How it works

Quercetin is a flavonoid that stabilizes mast cells and basophils, preventing them from releasing histamine and other inflammatory mediators triggered by allergens like pollen.

Where to buy

Health food stores, Amazon, iHerb - brands include Thorne, NOW Foods, Jarrow Formulas

Typical cost: $15-$35 per month

Safety notes

May interact with certain antibiotics and blood thinners. Avoid doses above 1000 mg/day long-term without medical supervision. Not recommended during pregnancy.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

PubMed - Mlcek et al. 2016

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.