Fecal urobilinogen known as Stercobilinogen is a chemical that is created by bacteria in the gut. It is a byproduct of broken down haemoglobin. It is the chemical reaction of Stercobilinogen that gives the faeces the brown colour. In the human body, the pigment bilirubin is created from the breakdown of the heme; Stercobilinogen is produced in the intestinal tract as a reaction with the bilirubin. Stercobilinogen is excreted either from the liver or the kidney. However more than half of the urobilinogen re-circulates in the liver and then turns to the intestine.