3β-Cholic acid-d4 is intended for use as an internal standard for the quantification of 3β-cholic acid (Item No. 36447) by GC- or LC-MS. 3β-Cholic acid is a bile acid and an isomer of cholic acid (Item No. 20250).1 It has been found in human cecum and in postprandial urine samples from patients with non-alcoholic steatohepatitis (NASH).1,2WARNING This product is not for human or veterinary use.