Here are a few notes about the biological role of selenium. Selenium is essential to mammals and higher plants, but only in small amounts.
Selenium is said to stimulate the metabolism.
It may help protest against free radical oxidants and against some heavy metals. This is because Astragalus concentrates selenium. The following gives the abundances of the elements in humans . Just enter your weight in either kilograms or pounds. In some browsers, after entering your weight you may have to click outside the text entry box to make the calculation work.