Hill's Prescription Diet l/d Liver Care Dog FoodHill's Prescription Diet l d Liver Care Dog Food Hill's nutritionists and veterinarians developed Prescription Diet l d, clinical nutrition to support liver health and help protect vital liver function How it works: Controlled level of highly digestible protein Low copper to minimise accumulation in the liver Clinically proven antioxidants How it helps: Helps the liver tissue repair itself Helps avoid nutrient deficiencies & excesses related to liver