Chitin is found in the exo-skeletons of shrimp, crabs and other shellfish.
Chitosan has the unique ability to attach itself to lipids or fats. There are no calories in Chitosan since it is not digestible. Chitosan attaches to fat in the stomach before it is metabolized. Chitosan traps the fat and prevents its absorption. Fat binds to the Chitosan fibre is then eliminated from the body.