Supports muscle function in the performance horse. Particularly useful in those geographical areas where the soil is likely to be selenium deficient. Contains selenium yeast, safer to use than inorganic forms. Vitamin E is a powerful antioxidant that has the ability to stabilise cell membranes, thus helping to protect the cell from the detrimental effects of excess free radicals.Low in feeds of non-meat origin, Lysine can be deficient in many equine diets. Soil in some geographical areas around the UK is naturally low in selenium, which is when supplementing with Vitamin E, Selenium Lysine is particularly useful to improve the diet.