Condition
    Moderate Evidence
    Effectiveness 2/5

    Quercetin for Post-Nasal Drip

    Quercetin, a natural mast-cell stabiliser, has small trials reducing allergic rhinitis symptoms — the most common driver of post-nasal drip — making it a reasonable seasonal adjunct, though nasal steroid sprays and saline rinses have far stronger evidence.

    Overview

    Quercetin, a natural mast-cell stabiliser, has small trials reducing allergic rhinitis symptoms — the most common driver of post-nasal drip — making it a reasonable seasonal adjunct, though nasal steroid sprays and saline rinses have far stronger evidence.

    Verdict

    Mixed evidence

    How It Works

    Quercetin stabilises mast cells, reducing histamine and inflammatory mediator release in the nasal mucosa. Less histamine means less mucus production and less drainage down the throat.

    Dosing & Protocol

    Typical dose

    Recommended dose
    500 mg twice daily with food, ideally started before allergy season
    Expected timeframe
    2-4 weeks

    Protocol

    form
    Quercetin phytosome or quercetin with bromelain
    duration
    4-6 weeks alongside saline nasal irrigation
    co factor
    Take with food. Post-nasal drip is downstream of nasal inflammation, so the rationale is the same mast-cell mechanism. Evidence is mixed and indirect: no trial has post-nasal drip as its primary outcome, so this rests on allergic rhinitis data. Saline irrigation is the intervention with the most direct benefit.
    titration
    Up to 1500 mg/day in divided doses
    starting dose
    500 mg quercetin twice daily with food

    Evidence

    What the studies say

    Small randomised trials and pilot studies show quercetin (500-1,000 mg daily) reduces rhinitis symptoms including sneezing and discharge. The evidence is modest — small samples, short durations — and indirect for post-nasal drip as an endpoint. By contrast, intranasal corticosteroids have strong RCT evidence for allergic rhinitis, and saline irrigation has Cochrane support. Quercetin does nothing when reflux or sinusitis is the driver.

    No studies are yet linked to both Quercetin and Post-Nasal Drip.

    Safety

    Caveats

    Generally well tolerated; possible headache and tingling at high doses. May interact with antibiotics and blood thinners at supplement doses.

    Less likely to help if

    People whose drip is caused by laryngopharyngeal reflux or chronic sinusitis.

    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.