This Iams ProActive Health formula has PreBiotics that work inside the digestive tract to promote healthy digestion and strong defenses. Healthy inside. Healthy outside. Iams ProActive Health with Chicken also helps maintain lean muscles and a healthy weight by providing the right amount of choice chicken baked into crunchy kibbles that keep teeth clean, tartar-free. It?s also fortified with minerals for strong bones, taurine for healthy heart and eyes and rich in fish oils for a sleek, shiny coat. Plus, it has a gentle fiber to support your cat?s ability to absorb nutrients.