Prebiotics are nutrients that feed the billions of microbes in the gut microbiome that are essential for good health. Our breakthrough blend of prebiotics, ActivBiome+, supports each pet's unique microbiome for healthy digestion & overall well-being At Hill's, we study pets' biology to understand how nutrition impacts digestive health. Prebiotics are nutrients that feed the billions of microbes in the gut microbiome that are essential for good health. Our breakthrough blend of prebiotics, ActivBiome+, supports each pet's unique microbiome for healthy digestion & overall well-being. You can make a difference in the lives of shelter pets. With every purchase of Science Diet you help feed over 100,000 homeless pets every day, 365 days a year. Recommended for: Adult dogs 1 - 6 years to help keep their digestion in balance Not recommended for: Puppies, adult dogs ages 7+, pregnant or nursing dogs. During pregnancy or nursing, dogs should be switched to Hill's Science Diet Puppy food.