http://articles.mercola.com/sites/articles/archive/2002/01/19/selenium-part-four.aspxThe essential trace mineral, selenium, is of fundamental importance to human health. As a constituent of selenoproteins, selenium has structural and enzymic roles, in the latter context being best-known as an antioxidant and catalyst for the productionenCommunityServer 2008.5 SP1 (Build: 31106.3070)