Hills"s Science Diet is the #1 choice of U.S. veterinarians to feed their own pets. Hill"s Science Diet Adult Optimal Care Ocean Fish and Rice Recipe cat food provides precisely balanced nutrition to maintain vital organ health and lean muscles with the great taste of Ocean Fish. It contains a precise balance of essential nutrients and clinically-proven antioxidants to maintain superior overall health and a strong immune system. It also has added taurine to help maintain heart health and controlled phosphorus to maintain kidney health. Recommended for adult cats 1 to 6 years of age but not recommended for kittens, pregnant or nursing cats.