Small intestine support system.The first step in this 1-2-3 probiotic system.Available in dairy or vegetarian-vegan appropriate dairy free formulas.Natren's DDS-1 and NAS super strains prefer to reside along the small intestine (walls) where most of the digestive process takes place. Acidophilus is also a resident bacterium of the oral cavity vaginal tract and in part the urinary system.Each serving of MEGADOPHILUS (either 1/2 tsp. (1 gram) powder or one capsule) provides a minimum of 2 billion cfu of: Lactobacillus acidophilus DDS-1 super strain in the dairy cultures or Lactobacillus acidophilus NAS super strain in the dairy free vegetarian/vegan cultures.Other products from HerbsPro