Selenium is an important trace mineral which means the human body needs in small quantities 
This nutrient has antioxidant properties and is involved in defence against oxidative stress
It exists in 2 forms, inorganic and organic and both can be good dietary sources .
However, the amount of selenium in plant based-foods can vary widely depending on the selenium content of the soil in which it is grown.
Also, men tend to have higher selenium levels usually than women .