Vitamin E is a fat-soluble intracellular antioxidant, involved in stabilising unsaturated fatty acids. The main antioxidant property is preventing the formation of toxic free radicals and oxidation of the unsaturated fatty acids in the body. These free radicals can be formed in periods of disease or stress in the body. Selenium is a component of the enzyme glutathione peroxidase, which plays an important role in the protection of cells by destroying oxidising agents like free radicals and oxidated unsaturated fatty acids.