Udo's Choice Adult's Blend Probiotic 60 Vegecaps contains 6 adult-specific bacterial strains at an appropriate strength, designed specifically to reflect healthy adult microflora. An adult’s healthy microflora will closely resemble that of a child but due to their larger size, an adult needs much greater quantities of the same bacteria. The specific strains used in Udo's Choice Adult's Blend Probiotic 60 Vegecaps have been specially chosen for their value to adult health & have been formulated to the viable count appropriate for adults.