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. Chitosan attaches to fat in the stomach before it is metabolized. Chitosan traps the fat and prevents its absorption in the digestive tract. Chitosan fibers bind to the fat and become a large mass which the body cannot absorb. Neutralizing fat after it enters the stomach, chitosan spares the body from having to deal with the fat.