How much selenium does each person need to supplement?

In recent years, scientists at home and abroad have done a lot of research on the appropriate supplement of selenium in daily diet. They think that the physiological requirement of selenium is 40 micrograms per day, and the toxic dose of selenium is 800 micrograms per day. Therefore, it is suggested that the supply range of selenium is 50~250 micrograms per day, and the maximum safe intake of selenium is 400 micrograms per day. The above data have been used by FAO (Food and Agriculture Organization of the United Nations), WHO (World Health Organization) and the International Atomic Energy Agency (IAEA).

In 2000, the Nutrition Society of China formulated the recommended caloric intake (RNI) and the maximum tolerable intake (U L) of dietary selenium for China residents at 50 micrograms per day, and formulated the dietary selenium reference intake for different age groups, pregnant women and lactating mothers.