Chitosan is from chitin, a carbohydrate in shellfish. Its makeup is chemically similar to cellulose, plant fiber.
Chitosan binds to fat in the digestive system and prohibits its absorption. It can lower cholesterol and has been known to help in weight loss.
Supplements are available in a variety of dosages. Some may be sold in 500 milligram pills or 1000 milligram pills.
Sources in the Diet
Recent Studies and Articles
Chitosan lowering cholesterol
Chitosan and immune response
Chitosan and shrimp shells
-  – The New Encyclopedia of Vitamins, Minerals, Supplements, and Herbs
-  – http://www.doctorvitaminstore.com/9098_Chitosan.html
-  – http://www.puritan.com/diet-lifestyle-072/chitosan-500-mg-004945?scid=26593&cmp=gpl-_-Diet%20and%20Lifestyle-_-004945&CAWELAID=1782916644&catargetid=1798093192&cadevice=c&cagpspn=pla&gclid=COz4o7HHgrgCFYSk4AodMCoAyA