It is a kind of biological polymer polysaccharide, which has significant protective effect on gastric mucosa and nourishing stomach. It is purely natural, has no side effects, has good affinity to human body, can effectively activate cells, completely different from nutritional health products, has the effect of enhancing immune function, inhibiting aging, preventing diseases, promoting disease recovery and regulating human physiological functions. Chitosan is the product of chitin deacetylation, which is the water-soluble product of chitin after deacetylation by concentrated alkaline water, and can be used in medical surgical sutures, hemostatic and wound covering materials, drug carriers, contact lenses, hemodialysis membranes, gastric acid inhibition and tumor cells, etc. It can be used in health care products to enhance human immunity, anti-cancer and cancer prevention, etc. It has significant auxiliary effects on the treatment of diarrhea and gastrointestinal diseases. It is also used in cosmetics, agriculture, food processing, etc. Therefore, Chitosan has anti-aging and other health care functions.