Selenium is a nutrient that is naturally present in many foods, added to others and is also available as a dietary supplement in pill, powder and liquid form, explains Perri Halperin, a nutritional ...

Selenium deficiency refers to not having enough selenium in your system. Symptoms may include fatigue, muscle weakness, and infertility, among others. The amount of selenium in food sources is largely ...

Our modern, industrial diets can be full of calories but paradoxically low in some important minerals. Having enough of these minerals, such as magnesium, is vital to good physical and mental health.