Chitosan has been used in water purification plants to absorb greases, oils, metals, and toxic substances. Chitosan has been used in the cosmetic and fabric industry..
There is some evidence of the effect of chitosan on lowering cholesterol and body weight, but the effect is unlikely to be of importance. Chitosan dressings are sometimes used in emergency rooms to control bleeding. Chitosan has been used in various drug delivery systems. Antimicrobial and other effects are being evaluated for use in dentistry.