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 & 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.