Selenium is a vital component of the bodys defense mechanisms against oxidative stress, plays a key role in the metabolism of thyroxine, is a valuable factor in the health of the reproductive system. For these reasons, its insufficient intake through the diet constitutes a serious nutritional deficiency. Antioxidants are a class of substances that contribute to strengthening the bodys natural defense against free radicals which are naturally produced in the human body, and if not neutralized, can damage tissues and organs. Like selenium, Vitamins A, C and E are also known for their antioxidant properties. Lamberts Selenium with A, C and E provides 200μg of selenium combined with adequate levels of Vitamin A.