Prescription Diet c/d Multicare is clinical nutrition tested to lower the recurrence of most common urinary signs by 89% 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 contains controlled levels of magnesium, calcium and phosphorous to help reduce the building blocks of struvite and calcium oxalate stones. It's also enriched with antioxidants, potassium citrate and omega-3 fatty acids. Please consult your veterinarian for further information on how Prescription Diet foods can help a cat continue to enjoy a happy and active life.