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Immune SupportDietary Supplement 750 mg Quercetin 200 mg of Vitamin C 11 mg Zinc in Each Serving Quercetin is a flavonoid antioxidant that has been shown to have immune-supportive properties. It has been suggested to support the immune system through its antioxidant properties which help protect the body against oxidative stress and cellular damage. Quercetin may also support the production and activity of immune cells which help to support the overall function of the immune system. Preliminary laboratory and animal studies have found quercetin may be also have a positive impact on gut health.