Selenium-based dietary supplement. Selenium is an essential trace element for humans, which is required in small amounts. Humans and animals require selenium for the functioning of several selenium-dependent enzymes, also known as selenoproteins. Selenium contributes to the normal functioning of the immune system and to the protection of cells against oxidative damage. Suitable for vegetarians and vegans. Directions for use: Take 1 capsule in the morning with plenty of water.