Morinaga BB536 is a proprietary room-temperature stable strain of Bifidobacterium longum. It is one of the world?s most researched and effective probiotic strains, supported by over 50 published human clinical studies, and is Japan?s top-selling probiotic. Levels of Bifidobacterium decline with age, making supplementation important. Source of probiotics. Helps support intestinal/ gastrointestinal health.* Could promote a favorable gut flora.* Helps support healthy immune system function in senior citizens.