Hyodeoxycholic acid is a member of the class of 5beta-cholanic acids that is (5beta)-cholan-24-oic acid substituted by alpha-hydroxy groups at positions 3 and 6. It is a bioactive compound extracted from Calculus bovis. It has a role as a mouse metabolite and a human metabolite. It is a C24-steroid, a bile acid, a member of 5beta-cholanic acids and a 6alpha,20xi-murideoxycholic acid. It is functionally related to a cholic acid. It is a conjugate acid of a hyodeoxycholate. Hyodeoxycholic acid is a secondary bile acid formed in the small intestine by the gut flora, and acts as a TGR5 (GPCR19) agonist, with an EC50 of 31.6 µM in CHO cells. Hyodeoxycholic acid has hypolipidemic effect through regulation of FXR activation, it is a candidate for antiatherosclerotic drug, by significantly increasing the expression of genes involved in cholesterol efflux, such as Abca1, Abcg1,and Apoe,in a macrophage cell line.