This product is sulfated chain mucopolysaccharide sodium salt extracted from the cartilage of healthy animals. Its terrestrial source is porcine, bovine, sheep, chicken, duck and other poultry; The marine sources are mainly sharks, salmon, etc. Chondroitin sulfate in cartilage combines with protein and exists in the form of proteoglycan. Chondroitin sulfate sodium is mainly composed of sodium sulfate salt of the copolymer of N-acetylgalactosamine (2-acetamide-2-deoxy-D-galactopyranose) and D-glucuronic acid, and hexose in the copolymer is alternately connected by P-1,3 and P-1,4 glycosidic bonds. The molecular formula of chondroitin sulfate sodium is H(C₁₄H₁₉NNa₂O₁₄S)_xOH, the molecular weight is 5000 to 50000 dalton , and the assay of chondroitin sulfate sodium is 90.0%~105.0% on dry base.