Quercetin is a flavanoid, or more specifically classified, a flavnol, found in many plants. Quercetin is found most commonly in rutin form although it can be bound to other glucose molecules for other forms. Quercetin demonstrates antioxidant and anti-inflammatory abilities. It can also act as an inhibitor of nitric oxide and tyrosine kinase. Quercetin prevents the production and function of leukotrienes and prostaglandins as well as hinders the release of histamine by basophils and mast cells. There is also evidence that quercetin can decrease capillary weakness.
Quercetin and quinolones should not be taken together as they compete to bind to DNA. Cyclosporine, estradiol, cisplatin, and felodipine should not be taken with quercetin as they decrease absorption and effectiveness. As with any drug or supplement, consult a health care professional.
Quercetin is well tolerated by most people in the recommended dosage. Some people have experienced headache, nausea, and a tingling of the extremities.
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