Perfect Probiotic™ 120 Billion is an ultra strength probiotic to help resolve acute intestinal concerns and restore balance after antibiotic use. It features 19 human strains and the Perfect Prebiotic™ blend to feed and support your entire digestive tract — in a delayed release vegetable capsule. Plus, it’s part of the world’s first TRU-ID® Certified probiotic family; guaranteed to include every species on the label.