Purina SuperSport Pellet is an amino acid supplement that a scientifically formulated to support performance horses that are subject to a more demanding physical regiment. Added with Vitamin E and Selenium to help support muscle recovery with a palatable , grain free base suitable for horses requiring a stricter diet. Product Details: Recommended for racehorses, performance horses, showjumpers, eventers, barrel racers, and endurance horses Formulated by Purina Ph.D. Equine Nutritionists Quality controlled and ensured Supports the recovery, performance, and muscle mass of horses 25 lb bag provides approximately a 37 day supply for one average sized horse