Selenium is an essential trace element for the human body, which has very important physiological functions and is closely related to human health.
Selenium is incorporated into a number of functionally active selenoproteins, including the enzyme glutathione peroxidase, which acts as a cellular protector against free radical oxidative damage.
Wide variations have been found in selenium status in different parts of the world, and population groups with marginal selenium intake are more numerous than was previously thought.
