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 Tuna helps build strong, lean muscles with protein sourced from tuna, egg and chicken. It’s enriched with omega-3 essential fatty acids and brewer’s yeast for healthy skin and coat, as well as antioxidants like vitamin E to support the immune system. Beet pulp provides a gentle fiber that enhances your cat’s ability to absorb nutrients and helps maintain a healthy digestive system.