Selenium

Selenium is an element found in certain enzymes that help with normal body functions.

Selenium supplements are used as a preventative measure, or in the treatment of selenium deficiency.

Selenium deficiencies can result with changes in fingernails, muscle weakness, and heart problems.

In a study aimed to see if the antioxidant selenium might improve glucose metabolism, researchers discovered the opposite. According to research to be published in the August 21, 2007 print issue of the Annals of Internal Medicine, selenium actually increases the risk of Type 2 diabetes.