An official Web-site of The usa federal government. Here's how you understand we are official. dot gov icon Nonabsorbed ursodiol passes into your colon where it is mostly 7-dehydroxylated to lithocholic acid. Some ursodiol is epimerized to chenodiol (CDCA) via a 7-oxo intermediate. Chenodiol also undergoes 7-dehydroxylation to kind https://www.youtube.com/watch?v=A07qHOeWON8