Poly Zinc Powder make it easy to balance your horse's diet by focusing solely on zinc. While there are a variety of important trace minerals needed for your horse's diet, zinc is commonly deficient in high iron diets, as iron tends to impair both zinc and copper absorption. Zinc plays important roles in the body for proper function of proteins, bone development in young horses, healthy hooves, and coat pigmentation. To maximize bioavailability and its effect, the zinc in Poly Zinc Powder is partnered with polysaccharides to help protect the key minerals until they reach the digestive site where they can be most effectively absorbed and utilized.