Quest Synergistic Selenium 200mcg contains selenium, which is an essential mineral; it has a vital antioxidant role and is involved in the health of the prostate, the thyroid and the immune system.Quest Synergistic Selenium 200mcg formula contains both antioxidant vitamins C & E. Selenium is the principal component of the antioxidant enzyme glutathione peroxidase and is a vital antioxidant to help maintain overall health. Selenium can also be used specifically to support immune function.Directions:Take one tablet daily with food. Swallow with water. Do not exceed direction for use.Actives:Vitamin E (25 i.u.) 17 mg α-TE 142Vitamin C 100 mg 125Mineral amino acid blend 20 mgproviding:Selenium 200 μg 364Ingredients:Vitamin C (with hydroxypropylmethylcellulose), di-Calcium Phosphate, Bulking agent: Microcrystalline Cellulose, Vitamin E (natural source Vitamin E from non-GM Soya), Mineral amino acid blend (providing sodium selenite complexed with citric acid, aspartic acid, glycine, hydrolysed rice protein), Magnesium Stearate.Warnings:Do not exceed directions for use.