What is the function of selenium in selenium-enriched food? Why is selenium an essential trace element for human body? Health experts of Hubei Development Co., Ltd. analyzed that selenium participates in the synthesis of various selenium-containing enzymes and selenium-containing proteins in human body. Among them, glutathione peroxidase catalyzes the conversion of hydroperoxide or lipid peroxide into water or various alcohols in organisms, eliminating the attack of free radicals on biofilm and protecting biofilm from oxidative damage; Selenium participates in the formation of iodothyronine deiodinase. It can be seen that selenium plays an important role in our body.