Selenium is one of the essential elements in the human body. Many physiological activities in the human body, such as the metabolism of thyroid hormones, the synthesis of DNA, the protection of cell membranes from oxidative damage, and the prevention of infections, require the participation of selenoproteins. In many selenoproteins, the presence of selenium directly affects their physiological activity.

Selenium supplementation has a certain anticancer and antioxidant effect, but it needs to be controlled within a reasonable and scientific dosage, if more than the recommended dosage, long-term use, not only can not prevent cancer but may cause cancer.

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The Chinese Nutrition Society (CNS) has set the daily supply of selenium at 15 micrograms for 1 year olds, 20 micrograms for 1-3 year olds, 40 micrograms for 4-6 year olds, and 50 micrograms for 5 year olds to adults.

Selenium content in the diet in most areas of China is sufficient and safe, normal people can generally meet the body's selenium needs through the diet, only those who are blind dieting, partiality, strict vegetarian and was determined to be selenium-deficient body or some patients with acute and chronic illnesses, it is necessary to increase the intake of selenium in particular, if the supplementation of a number of multivitamins, it is even less necessary to intentionally make up the selenium.

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