In Medicine, health care products:
Chitosan is useful in promoting tissue growth in tissue repair and accelerating wound-healing and bone regeneration.
Chitosan also can be incorporated into hydrogels and microspheres which demonstrate large potential in delivery systems for drugs, proteins or genes.
In Health Food:
Chitosan has a strong positive charge helps it bind to fats and cholesterol and initiates clotting of red blood cells.Also can be used as food additive.
- Cholesterol-lowering effects. 
- Fiber and weight loss effects.
In Agriculture:
Chitosan is an ecologically friendly biopesticide substance that boosts the innate ability of plants to defend themselves against fungal infections, also can be used as soil improvement agent, seed treatment and plant growth enhancer. 
In Cosmetic Industry:
Chitosan's strong positive charge allows it to bind to negatively charged surfaces such as hair and skin which makes it a useful ingredient in hair and skin products.