Selenium is a major component of a group of antioxidant enzymes, called selenoproteins. These enzymes help protect our body from free radical damage. It also plays an important role in promoting prostate health. Selenium is an essential trace mineral, meaning our body doesn't produce it, so we must get selenium from the foods we eat. If our diet falls short, a selenium supplement may be a great option. Each Carlson Selenium capsule contains 200 mcg of organically-bound selenium from l-selenomethionine.