It supplements are promoted as weight-loss agents that act by preventing the absorption of dietary fats from the intestines. Like some plant fibers, chitosan is not digestible. Therefore, it has no caloric value. This is a very important property for any weight-loss product. Unlike plant fibers, its unique properties give it the ability to significantly bind fat, acting like a "fat sponge" in the digestive tract. It purports to have the capability of attracting fat from the digestive system and expelling it from the body so that users can lose weight without eating less. It has the very unique ability to lower LDL cholesterol while boosting HDL cholesterol. It can effectively lower blood serum cholesterol levels with no apparent side effects. It can aid healing and recovery from skin grafts. It has also been found to have anti-fungal and anti-bacterial properties and can be applied to the skin to heal wounds more effectively.