Quercetin is a powerful antioxidant flavonoid found in a wide range of foods and plants including apples, various berries, green tea, red grapes, onions and ginkgo biloba. Quercetin’s antioxidant effects help promote immune health and studies have also shown that it can support sinus and respiratory health. Quercetin is often combined with bromelain in supplements, since bromelain may enhance the absorption of quercetin, but bromelain offers benefits of its own.
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