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Quercetin 500 mg from webber naturals contains a concentrated source of the bioflavonoid quercetin in easy-to-swallow vegetarian capsules. Quercetin is used in herbal medicine to protect blood vessels, including the capillaries. It also provides a source of antioxidants to help your body neutralize the free radicals responsible for oxidative damage.features: source of antioxidantsused in herbal medicine as a capillary