Help your aging horses live up to their fullest potential with Purina Impact Professional Senior Horse Feed, with premium nutrition optimized for your aging horse. Impact is formulated with only high-quality ingredients that have been proven through years of feedings to support overall horse health and performance. It is a complete feed with high-quality forage built in to replace hay or pasture in your senior horse's diet, and controlled starch and sugar formulated with no corn or corn byproducts. With over 100 years of expertise, extensive research in equine nutrition, and a dedicated team of Ph.D. Equine Nutritionists nobody knows more about horse nutrition than Purina. See the difference Impact Professional Senior can make for your aging horses.