Dr. formulated probiotics. 80 billion CFU guaranteed. 15 probiotic strains. Colon health. Immune system. David Perlmutter, M.D: Formulated by one of America's leading experts in the human microbiome, a board-certified neurologist, no. 1 New York Times best-selling author and fellow of the American College of Nutrition. Dr. Perlmutter created this unique formula with a high potency count of beneficial probiotics, made from diverse strains that are resistant to stomach acid and bile, for daily colon and immune system support. Colon support with l. acidophilus NCFM. Immune System Support: 80 billion CFU, 15 probiotics. Made without dairy or soy ingredients, peanut, tree nut or shellfish. Package size is determined by labeling information, not the number of servings in this container. The serving size and contents are clearly marked.