Perfect Probiotic™ Adults 50+ 50 Billion is specially formulated with a higher ratio of Bifidobacteria probiotic strains to support the digestive health of Adults 50+. Featuring 8 probiotic strains to 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.