Saccharomyces cerevisiae is a non-colonizing yeast (it does not adhere to the intestinal wall), but it reaches a high concentration of living form in the gut. Cerevisia contains one specific yeast strain: Saccharomyces cerevisiae CNCM I-3856 that has been selected after years of research from 6000 strains. This specific strain is registered with the National Collection of Cultures of Micro-organisms to ensure the exclusive use of the patented strain into Cerevisia. Different Saccharomyces cerevisiae yeast strains are being used for a long time in the making of bread, yogurt, wine and beer. They are commonly known for their influence on digestion.