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Selenium is a chemical element, the chemical symbol is se, in the periodic table of chemical elements in the fourth cycle of VI a group, is a non-metallic. It can be used as photosensitive material, catalyst for electrolytic manganese instry, essential nutrient elements for animals and beneficial nutrient elements for plants
1. Selenium has anticancer effect. Selenium deficiency is prone to liver cancer, lung cancer, gastric cancer, esophageal cancer, kidney cancer, prostate cancer, bladder cancer, cervical cancer, leukemia and so on Selenium has antioxidant effect. Selenium is the best anti-aging material. If the human body lacks selenium, it will be "no longer young" and lead to premature aging Selenium can enhance human immunity. Lack of selenium makes the body's immune ability decline Selenium can antagonize harmful heavy metals. Selenium deficiency is easy to lead, arsenic, cadmium and other heavy metal poisoning symptoms Selenium can regulate the absorption and utilization of vitamin A, vitamin C, vitamin E and vitamin K. Selenium deficiency can cause myopia, cataract, retinopathy, funs diseases, age-related macular degeneration and other diseases Selenium has the function of regulating protein synthesis. Selenium deficiency can cause protein and energy deficiency, malnutrition, chromosome damage and so on Selenium can enhance reproctive function. Selenium deficiency can cause ejaculation blocked, low sperm motility, malformation, reced pregnancy rate, increased incidence rate of myositis,8 and selenium are important components of muscle function. Selenium deficiency causes skeletal muscle atrophy and gray stripe, resulting in myocardial damage, cardiac cell densification, lipid increase, calcareous deposition, and disease. p> Second, the correct way to supplement selenium
eat more foods enriched with organic selenium, fruits and vegetables and other foods rich in vitamin A, C and e to promote the absorption of selenium
The contents of selenium in viscera and seafood were 0.4-1.5mg/kg; Lean meat 0.1-0.4mg/kg; Grain 0.01-0.04mg/kg; 1-0.3mg/kg for dairy procts; Fruits and vegetables 0.1mg/kg Selenium can not be synthesized in human body, so it is necessary to supplement selenium every day to meet the demand of human body. According to the requirements of the World Health Organization, the minimum daily requirement of selenium in human diet is 40 micrograms, and the nutritional supplement is 50-250 micrograms 
selenium supplement should not be excessive
because excessive intake of selenium can lead to poisoning, hair loss, nail removal, etc. The dietary selenium content in most areas of China is adequate and safe
The clinical selenium poisoning caused by excessive selenium can be divided into acute, subacute and chronic. The main cause of poisoning is that the body directly or indirectly ingests and contacts a large amount of selenium, including occupational and regional reasons, eating habits and drug abuse Therefore, the intake of selenium should be strict and accurate, and it is recommended to take selenium supplements with national certification