Bile acids, first of all bile acids are the main component of bile and they play a very important role in regulating the metabolism of fats. Its physiological role, in the intestine can perform its own physiological functions in various forms of bile acids. Often, if in the lower part of the intestine, bile acids themselves can change and be reabsorbed by active transport or passive transport under the transforming action of bacteria in the intestine. Bile acids can be absorbed and excreted through the intestinal tract, carrying out two related properties, namely solubility and polarity. Bile acids still play a major role in fat metabolism and are then present in the enterohepatic circulation and play a role through recirculation.