Natural Factors Quercetin Complex is an antioxidant formula especially developed to help maintain optimal health and prevent accelerated aging by reducing free radical formation. It supports cardiovascular and circulatory health, is used for immune health, and may help calm allergy symptoms. 

Quercetin (Sophora japonica) (bud)|250 mg GrapeSeedRich® grape seed extract(Vitis vinifera) (80% proanthocyanidins)|166.6 mg Blood orange extract (30:1) (Citrus sinensis) (fruit)|33.3 mg Turmeric extract (Curcuma longa) (root)(95% curcuminoids)|6.6 mg Coenzyme Q10 ubiquinone (microorganism)|10 mg Other ingredients: Rice starch, vegetarian capsule (carbohydrate gum [cellulose], purified water), silica, vegetable grade magnesium stearate (lubricant).

1 Capsule 1-3 times per day or as directed by a health professional.

Afanas' ev, Igor B., et al. "Chelating and free radical scavenging mechanisms of inhibitory action of rutin and quercetin in lipid peroxidation." Biochemical pharmacology 38.11 (1989): 1763-1769. http://www.sciencedirect.com/science/article/pii/0006295289904103 Manach, Claudine, et al. "Quercetin metabolites in plasma of rats fed diets containing rutin or quercetin." The Journal of nutrition 125.7 (1995): 1911-1922. http://europepmc.org/abstract/MED/7616308 Formica, J. V., and W. Regelson. "Review of the biology of quercetin and related bioflavonoids." Food and chemical toxicology 33.12 (1995): 1061-1080. http://www.sciencedirect.com/science/article/pii/0278691595000771