A prominent dietary bioflavonoid found in onions, capers, and apples. Quercetin is nature's premier mast cell stabilizer, inhibiting IgE-mediated histamine release. It also acts as a potent zinc ionophore, supports vascular nitric oxide synthesis, reduces systemic inflammation, and lowers blood pressure.
Educational information only — never stop or change a prescribed medication without talking to your prescriber first.
Generally very well tolerated. High doses (>1,000 mg/day for prolonged periods) should be monitored for renal function. May interact with antibiotics (fluoroquinolones) and medications metabolized by CYP3A4.
Evidence level: Strong
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