CAG-170 was discovered earlier this year and is a bacteria in the gut. CAG-170 produces Vitamin B12. It is assumed that instead of this vitamin helping you directly, it will support other gut bacteria. Dr. Alexandre Almeida, a researcher in the University of Cambridge's Department of Veterinary Medicine who led the study, said: "Our work has revealed that CAG-170 bacteria -- part of the 'hidden microbiome' -- appear to be key players in human health, likely by helping us to digest the main components of our food and keeping the whole microbiome running smoothly." He also said that "We looked at the gut microbes of thousands of people across 39 countries and 13 different diseases including Crohn's and obesity. We consistently found that people with these diseases had lower levels of CAG-170 bacteria in their gut."