Prescription Diet Derm Complete is the only nutrition clinically tested for both food and environmental allergies*. It’s made in the USA with global ingredients you can trust, and was developed by Hill’s nutritionists and veterinarians. This nutrition is formulated to promote an environment that makes it difficult for struvite and calcium oxalate crystals to form. Please consult your veterinarian for further information on how Prescription Diet foods can help your dog continue to enjoy a happy and active life