Quest Vitamin C is a potent antioxidant, protecting tissue against the potentially damaging effects of free radicals. It is required.Quest Vitamin C supplements are chosen to support the immune system. Vitamin C is a powerful water soluble antioxidant and needs to be continuously replaced.Directions:Take one to three tablets daily with a meal. Swallow with water. Do not exceed directions for use.Actives:Vitamin C 500 mg 833 Citrus Bioflavonoids Complex 50 mgIngredients:Vitamin C (Ascorbic Acid, Hydroxypropylmethylcellulose), Citrus Bioflavonoids Complex (Citrus Powder, Calcium Sulphate, Cellulose, Stearic Acid, Magnesium Stearate, Guar Gum), Bulking agent: Microcrystalline Cellulose, Magnesium Stearate, Anti-caking agent:Silicon Dioxide, Glazing agent: HydroxypropylmethylcelluloseWarnings:Intakes above 1000mg of Vitamin C may cause slight stomach upset in sensitive individuals. Individuals predisposed to oxalate kidney stone formation should avoid high dose vitamin C supplementation. Individuals on anticoagulants should limit their intake to 1g/day.