Since 1947 Two Billion Probiotic Cultures** Probiotic Acidophilus Support Digestive System Health Absorption of Nutrients Immune System Function No Refrigeration Needed Dietary Supplement ** 2 Billion live organisms per bead at time of manufacture. Solgar"s probiotic acidophilus beads are specifically formulated in a unique shell that is designed to release the active bacteria in the intestines where they are most beneficial for this proprietary blend of Lactobacillus acidophilus, Bifidobacterium longum, Lactobacillus plantarum and Bifidobacterium lactis helps balance intestinal microflora for digestive systems health. A healthy digestive system supports a favorable environment for the absorption of nutrients. Probiotics are also important for supporting a healthy immune system.