Eating selenium has many benefits. Selenium is one of the essential trace elements for human body. First, selenium can play an antioxidant role, and selenium is one of the best anti-aging substances. Trace elements found that selenium decreased and needed to be supplemented in time. Second, enhance human immunity. If selenium is reduced, immunity will decline. Third, the anti-cancer effect. Fourthly, adjust the synthetic function of protein. If lacking, it will cause energy deficiency, malnutrition or chromosome damage in protein. Fifth, enhance reproductive function. Selenium deficiency can cause ejaculation disorder, low sperm motility and deformity, so selenium can enhance reproductive function. Sixth selenium can regulate the functions of vitamin A, vitamin C, vitamin E, etc. Selenium deficiency can cause myopia, cataract, retinopathy and fundus diseases. So selenium is very helpful to human body.