Dietary Supplement Antioxidant Helps Support Immune System* With Vitamin C & Bioflavonoids Found in apples, tea, grapes and other foods, quercetin is an antioxidant which can support your immune system*. Natrol® Quercetin adds a Citrus Bioflavonoid Complex. No Yeast, Wheat, Corn, Milk, Egg, Soy, Glutens, Artificial Colors or Flavors, Added Sugar, Starch or Preservatives. Join the Natrol Nutrition Club. Get free stuff and learn about the least nutrition and health news. natrol.com *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.