Nano-selenium is a kind of selenium first, so the function of selenium is basically inherited by nano-selenium, but nano-selenium has the characteristics of low toxicity, high activity and high safety compared with other forms of selenium. Selenium is one of the essential trace elements in human life activities and an antioxidant in human body, which can improve human immunity and has many biological functions. Selenium is the first choice for selenium supplementation.

Selenium is an essential trace element for human body, which has the functions of enhancing immunity and resisting free radical damage. Selenium deficiency will lead to the decline of human immunity and induce systemic inflammatory response syndrome (SIRS). In nature, selenium usually exists in the form of compounds, which can be divided into inorganic selenium and organic selenium. According to the survey, about 700 million people in China live in selenium-deficient and selenium-deficient areas, which account for 70% of the total land area. Because the selenium in human body is mainly taken from food, and the selenium contained in daily food is not enough to meet the normal needs of human body, once it is excessive, it will cause selenium poisoning. As a new food functional factor, nano-selenium is less toxic than inorganic selenium and organic selenium. Therefore, the development of selenium nanoparticles, a new food functional factor, is of great significance to guide China people to eat rationally and supplement selenium scientifically.

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