Glycochenodeoxycholic acid-d4 is the deuterium labeled Glycochenodeoxycholic acid. Glycochenodeoxycholic acid (Chenodeoxycholylglycine) is a bile acid formed in the liver from chenodeoxycholate and glycine. It acts as a detergent to solubilize fats for absorption and is itself absorbed. Glycochenodeoxycholic acid (Chenodeoxycholylglycine) induces hepatocyte apoptosis[1][2].