Recommended For Mature Adult Cats over the age of seven. Product Information Proven to Nutritionally Boost the Immune System Antioxidants help protect against a health effect of aging on the immune system by enhancing your cat's natural defenses. The antioxidant in our breakthrough formula is proven to nutritionally boost your cat's immune system to help him remain healthy, vital, and happy for years to come. And for your cat's overall health, we've enhanced Iams Active Maturity with vitamin-rich fish oils. Wholesome protein provides essential amino acids to help maintain healthy muscle tone and promote a shiny skin and coat, and naturally provides taurine for clear eyes and a strong heart. Wholesome ingredients such as high-quality protein sources and select carbohydrate sources are easy to digest for less litter box waste and odor. Each kibble is easy for older cats to chew, yet crunchy to help keep teeth clean and strong. Now with Iams Daily Dental Care. As your cat chews, Iams Daily Dental Care helps slow tartar build-up by up to 40%.