Glucosamine is extracted from crab and shrimp shells and is the monomer of glucosamine derivative N-acetyl-D-glucosamine chitin. Glucosamine is the precursor of mucopolysaccharide, and mucopolysaccharide is the main component of articular cartilage, one of the important nutrients to form chondrocytes, and also the basic component of cartilage matrix and joint fluid. Therefore, glucosamine is widely used in the prevention and treatment of bone and joint diseases.

The industrial extracted glucosamine is divided into D-Glucosamine hydrochloride、D-Glucosamine sulfate potassium chloride、D-Glucosamine sulfate sodium chloride、N-acetyl-D-glucosamine.