Bifidophilus Flora Force contains several billion friendly bacteria per capsule from four different strains:Lactobacillus casei, Lactobacillus rhamnosus, Lactobacillus acidophilus and Bifidobacterium longum. The formula also contains short- and long-chain fructo-oligosaccharides (FOS) in its non-medicinal base. The normal, healthy human intestinal tract contains billions of micro-organisms, collectively called flora, that live in a delicate balance. They break down our food into easily absorbable nutrients and help maintain our overall health. But, factors such as stress, environmental conditions, poor diet or use of antibiotics can affect the natural balance of friendly microbes. Bifidophilus Flora Force provides billions of beneficial intestinal micro-organisms for a healthy balance of flora in the GI tract.