Simplify your feeding program for all your horses with Impact All Stages 12% Pelleted Horse Feed. Formulated with premium nutrition and a versatile formula that performs for horses of all ages and activity levels. With over 100 years of expertise and research in equine nutrition and a dedicated team of Ph.D. Equine Nutritionists and Equine Veterinarians, nobody knows more about horse nutrition than Purina. Purina® IMPACT® is formulated to deliver premium nutrition with only high-quality ingredients that have been proven through years of feedings to support overall horse health and performance.