UltraCruz Equine Lysine Supplement for Horses is a formula that helps to improve the quality and availability of protein in the diet, so it can be utilized more efficiently, and is recommended for equine diets low in alfalfa, clover and soy. Utilization of protein in the diet is one of the keys to efficient growth and muscle development. This amino acid supplement for horses provides pure Lysine as an easy to use, palatable pellet.