Hill's Prescription Diet Feline z/d wet food is especially formulated to help manage your cat's dietary sensitivity and help reduce the possibility of adverse reactions to food. Recommended for cats with adverse reactions to food (food allergy or food intolerance) and gastrointestinal disorders. Hill's Prescription Diet z/d is clinical nutrition specially formulated to help avoid skin and digestive signs from adverse food reactions in cats. It’s made in the USA with global ingredients you can trust, and was developed by Hill’s nutritionists and veterinarians. This food is formulated to promote an environment that makes it difficult for struvite and calcium oxalate crystals to form. It also has clinically proven antioxidants to help support a healthy immune system. Please consult your veterinarian for further information on how Prescription Diet foods can help your cat continue to enjoy a happy and active life. Hill’s Prescription Diet Feline z/d canned (wet) food contains highly hydrolysed protein to help avoid common food allergens.