Taurohyodeoxycholic acid is an orally active 6 alpha-hydroxylated bile acid. Taurohyodeoxycholic acid decreases colonic MPO activity, TNF-alpha, lL-6 serum levels and the expression of COX-2. Taurohyodeoxycholic acid alleviates trinitrobenzene sulfonic acid induced ulcerative colitis via regulating Th1/Th2 and Th17/Treg cells balance. Taurohyodeoxycholic acid ameliorates high-fat diet-induced nonalcoholic fatty liver disease in mice. Taurohyodeoxycholic acid prevents Taurochenodeoxycholic acid (HY-N2027)-induced hepatotoxicity in bile fistula rats. Taurohyodeoxycholic acid can be used for the study of nonalcoholic fatty liver disease (NAFLD), colitis and biliary fistula[1][2][3][4].