NAF Vitamin E, Selenium & Lysine Help support the muscle function in the performance horse with NAF Vitamin E, Selenium & Lysine. In some areas, soil may be deficient in various nutrients including selenium and lysine. NAF Vitamin E, Selenium & Lysine contains all the key vitamins such as selenium yeast and Vitamin E â€\\\" a powerful antioxidant to encourage the stabilization of cell membranes and protect them from excess free radicals. Studies have found this Vitamin E, Selenium and Lysine provide support to oxygen delivery to the lungs, natural growth and development, fertility and muscle function.