These special probiotic bacteria strains are resistant to digestive enzymes. The four bacterial strains found in Power-Dophilus have been selected to provide organisms capable of flourishing in all sections of the small and large intestines. Ingredients Lactobacillus rhamnosus 4.2 billion, Lactobacillus acidophilus 3.6 billion, Bifidobacterium lactis (bifidum) 3 billion, Bifidobacterium longum 1.2 billion 200 CT