Supplemented with amino acids and selenium Complete vitamin E supplement with selenium that the body needs to metabolize E-vitamin. Contains lysine and methionine, essential amino acids for building and repairing muscle, bone and soft tissues. Selenium, zinc and manganese are trace elements required in nutrient metabolism and muscle building. Deficiency occurs easily in a cold environment, during feed changes and pregnancy. Affects performance and endurance, and contributes to horse welfare. Vitamin E also affects the blood supply to the muscles by playing a vital part in the rehabilitation of the blood vessels. Silage is usually poorer in vitamin E as the acids in the fermentation process break down the vitamin.