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Quercetin is a flavonoid pigment abundant in onions, apples, capers, and red wine. As one of the most-studied plant polyphenols, it has been investigated for its antioxidant, anti-inflammatory, and immune-modulating effects. Quercetin stabilizes mast cells, the immune cells that release histamine, which is why many practitioners use it to support a balanced response during allergy season. It has also gained attention for its zinc-ionophore activity, helping zinc enter cells where it supports antiviral defenses. Bromelain (an enzyme from pineapple) is often paired with quercetin to enhance absorption. Typical doses are 500-1,000 mg daily.
Plant flavonoid that supports a balanced histamine response, capillary integrity, and antiviral immune activity.
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