Kohnke’s Own Cell-EComprehensive Vitamin E and Selenium Supplement For optimum muscle function in all racing and performance horses on diets low or inadequate in Vitamin E and selenium. In contrast to many other selenium containing antioxidants, Cell E PREMIUM contains only organic amino acid chelated selenium in selenium yeast for improved uptake. This helps ensure that there is no risk of selenium toxicity at the maximum dose rates recommended, as compared with