Jarro-Dophilus^® FOS contains strains that help protect and maintain a balanced intestinal microflora, and support immune function and intestinal health.* FOS is a natural prebiotic fiber that enhances the growth of beneficial bacteria in the intestinal tract.*|â€Minimum 3.4 billion viable cells at time of consumption, under recommended storage conditions and within Best Used Before date.|. . Synbiotic (Probiotic plus Prebiotic) with Six Documented Strains. Formulated with Inulin-Fructooligosaccharides (FOS) for added Nutritional Support to Beneficial Bacteria*