The role of selenium on the human body is as follows: first, selenium can enhance the antioxidant properties of the human body, reduce oxidative damage to the body, and has a positive effect on human myocardial metabolism and human cardiovascular, and can protect the cell membrane, regulate the absorption of vitamins as well as the utilization rate of the human body. Secondly, selenium can be taken with vitamin C or vitamin E, can enhance the antioxidant properties of the human body, can effectively remove free radicals in the body, help the human body anti-aging, enhance the elasticity of the human skin, effectively help the human body reduce wrinkles. Secondly, proper supplementation of selenium can also help the body to improve the immune system, enhance the immunity and resistance of the human body, effectively reduce the appearance of adverse diseases caused by external factors, and can promote the synthesis of certain proteins and enzyme catalysis, playing an important role in certain chemosynthesis reactions in the human body.