There are millions of bacteria inside each person, forming an internal world inside us which is often referred to as? The Microbiome?. There is currently a lot of research ongoing about the impact the microbiome may have on the rest of thebody. Natures Aid? PRO-100 Ultra is a super strength daily supplement containing 8 strains of bacteria. Each daily capsulecontains a guaranteed 100 billion live organisms, using 8 extensively researched strains of bacteria-Lactobacillus Acidophilus, Lactobacillus Casei, Lactobacillus Reuteri, Lactobacillus Plantarum, StreptococcusThermophilus, Bifidobacteria Lactis, Bifidobacteria Longum and Bifidobacteria Bifidum. Natures Aid? PRO-100 Ultra bacteria have been chosen due to their stability, and guarantee 100 billion live bacteria percapsule. Refrigeration is optional. Natures Aid? PRO-100 Ultra is dairy free.