Quercitin is a bioflavonoid frequently used to treat allergies because of its antihistamine, antiinflammatory, and antioxidant effects. It is found in foods such as berries, brassica vegetables, apples, green tea (Camellia sinensis), onions, and red wine. Studies have demonstrated that quercitin inhibits the release of histamine from mast cells and basophils.50 (Histamine is a chemical mediator responsible for allergy symptoms, such as constriction in the lungs, congestion, and sneezing.) Absorption of quercitin is variable and may be improved by combining it with papain or bromelain.
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