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Chitosan is a new dietary fiber derived from chitin, a polysaccharide, derived from the shells of crustaceans. Chitosan does not contain any appreciable amounts of toxic minerals such as mercury, which have previously been associated with the meaty portions of certain shellfish. It can reduce cholesterol, sterols, fatty acids, and essential fatty acids, etc. It can form elastic humid-keeping membrane when coated on skins and can keep enough humidity in horniness layer no matter in what kind of envioment humidity. It can be addictive to cosmetics, health care food and drug.