PURINA® PRO PLAN® Veterinary Diets FELINE EN Gastrointestinal formula is highly digestible which promotes optimal nutrient absorption, and is antioxidant-rich to support immune health. This high-protein cat veterinary diet also delivers an St/Ox defence to promote a urinary environment unfavorable to the development of both struvite and calcium oxidative crystals. Made with high-quality nutrition, the formula is energy-dense to provide essential sustenance in smaller meals and includes b-complex vitamin and omega-3 fatty acids from fish oil. The science behind Purina's therapeutic diets represents a collaboration between Purina nutritionists, researchers and veterinarians. Support your cat’s digestive health with Purina Pro Plan Veterinary Diets Feline EN Gastrointestinal Dry Cat Food Formula. PRO PLAN® VETERINARY DIETS FELINE EN is formulated to meet the nutritional levels established by the AAFCO (Association of American Feed Control Officials) Cat Food Nutrient Profiles for all life stages.