Chitosan hydrochloride, also called Chitosan HCL, the CAS number is: 70694-72-3, which can be directly soluble in water, it is a highly cationic chitosan derivative that can promote the absorption of nutrients or drugs by body cells, it can be used as an absorption enhancer for hydrophilic drugs and natural nutritional cosmetics, also used in medical dressings and carriers, food health care, and cationic flocculants. 1. Chitosan hydrochloride can be used as an absorption enhancer for hydrophilic drugs and natural nutritional cosmetics; 2. Chitosan hydrochloride maintains the quality of chitosan. It has good film-forming and antibacterial properties and can be used as additives and preservatives for food, fruits and vegetables, etc; 3. Chitosan hydrochloride has strong cationic properties and is used for sewage treatment, protein sedimentation recovery in food factories, and improving pulp utilization and paper product strength in the paper industry.