Selenium has antioxidant activity. Selenium may also have immunomodulatory, anticarcinogenic and anti-atherogenic activities. It may have activity in detoxification of some metals and other xenobiotics and activity in fertility enhancement in males. Selenium enters the food chain through incorporation into plant proteins as the amino acids L-selenocysteine and L-selenomethionine. T J Clark’s Catalyzed Selenium contains the most bioavailable form of selenium, L-selenomethionine. Catalyzed selenium is flavoured with fructose for greater patient compliance. Our phytogenic mineral catalyst is included for maximum nutrient utilisation and antioxidant protection.