Iams Premium Protection Senior 2.2 Lbs (Pack of 4) Advanced 2 part fiber system, includes FOS and beet pulp for healthy digestion High levels of Glucosamine and Chondroitin Sulfate formulated to help maintain healthy joints Enhanced with L-Carnitine to help keep older cats at a healthy weight High levels of the antioxidant vitamin E for immune system maintenance High levels of taurine to maintain heart and eye health in older cats