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 Hairball Care is specially formulated for adult cats to reduce hairballs by improving both your cat's coat and digestion. A unique blend of carbohydrates, beet pulp, and FOS (which promotes healthy bacteria in the stomach) improves your cat's ability to absorb nutrients, provides bulk to move food through the intestines, promotes colon health, and reduces waste and litter-box odors. It's also enhanced with fish oils, B-vitamins, and brewers yeast for a healthy skin and shiny coat that helps control hairball formation.