The present invention relates to a use of a microorganism of the classCoriobacteriiafor promoting gut health of a healthy subject. Also provided is a method for the production of chenodeoxycholic acid (CDCA) and a method for the production of lithocholic acid (LCA).本發明涉及一種紅蝽菌綱的微生物用於促進一健康個體的腸道健康之用途。還提供了一種生產鵝去氧膽酸(chenodeoxycholic acid,CDCA)之方法及一種生產石膽酸(lithocholic acid,LCA)之方法。