Hill’s Science Diet Adult Optimal Care dry cat food is recommended for adult cats ages 1?6. Exclusive blend of omega-6 fatty acids and other nutrients nourish your cat?s skin and coat. Contains a clinically proven antioxidant blend with vitamins C and E to support a healthy immune system. Made with high quality, easy-to-digest ingredients with no artificial colors, flavors or preservatives. Hill?s Science Diet is US Vets’ No. 1 Recommended (Based on a survey conducted amongst veterinarians in the US in 2017).