Farmina Vet Life Renal is a complete dietetic food for cats formulated to support the renal function in case of chronic or temporary renal insufficiency. This dietetic food contains low phosphorus concentrations and reduced protein content but of high quality.All Farmina Vet Life products require a prescription from your pet's veterinarian. Please email HappyPet@Farmina.com a copy of your prescription and order number within 48 hours to authorize your purchase. Any Vet Life orders that are not authorized will be canceled and refunded within 72 hours.