Condition
    Preliminary
    Effectiveness 5/5

    Quercetin for Chronic Urticaria

    Chronic spontaneous urticaria is mast-cell-driven, making quercetin biologically plausible. Case reports and small studies show reduced wheal frequency, but no large trials exist. Reasonable as an adjunct to second-generation antihistamines — the established first-line therapy.

    Overview

    Chronic spontaneous urticaria is mast-cell-driven, making quercetin biologically plausible. Case reports and small studies show reduced wheal frequency, but no large trials exist. Reasonable as an adjunct to second-generation antihistamines — the established first-line therapy.

    Verdict

    Mixed evidence

    Plausible adjunct for antihistamine-resistant hives; evidence is early.

    How It Works

    Stabilizes dermal mast cells and reduces histamine, leukotriene, and pro-inflammatory cytokine release that drive wheal-and-flare reactions.

    Dosing & Protocol

    Typical dose

    Recommended dose
    500 mg quercetin phytosome twice daily for 4-8 weeks
    Expected timeframe
    4-8 weeks; judge by flare frequency and intensity trends, not day-to-day variation.

    Protocol

    dose
    500 mg twice daily
    form
    Quercetin phytosome
    timing
    With meals, consistent daily use
    duration
    8-week trial alongside (not instead of) antihistamines
    monitoring
    Urticaria Activity Score (UAS7) weekly diary

    Evidence

    What the studies say

    Evidence is limited to small studies and case series showing quercetin (often with vitamin C) reduces urticaria severity and flares. No large placebo-controlled trials. Second-generation antihistamines (up-dosed per guidelines) and omalizumab for refractory cases have vastly stronger evidence.

    No studies are yet linked to both Quercetin and Chronic Urticaria.

    Safety

    Caveats

    Chronic hives lasting 6+ weeks deserve workup for thyroid autoimmunity and other triggers. Quercetin is an adjunct — do not discontinue prescribed antihistamines to test it.

    Less likely to help if

    No change in UAS7 after 8 weeks: discontinue and discuss antihistamine up-dosing or omalizumab with an allergist.

    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.