what is selenium
Selenium is an essential trace mineral important for cognitive function, a healthy immune system and fertility for both men and women. Selenium is found in a variety of foods, the richest sources being Brazil nuts, seafood and organ meats. The amount of selenium in food often depends on the selenium concentration of the soil and water where the food was grown or raised. This MNT Knowledge Center feature is part of a collection of articles on the health benefits of popular vitamins and minerals.