Hills C/D Multicare Bladder Health Cat Food 4 Lb Controlled levels of calcium, magnesium, phosphorus and oxalate to help limit the building blocks of crystals and bladder stones Rich in fish oil - an excellent source of Omega-3 fatty acids - to help promote healthy skin and a shiny coat Added potassium citrate to help interrupt bladder stone formation Increased levels of vitamin B6 to help decrease oxalate formation low sodium to maintain normal blood pressure