... the assay of 85%,90% and 95%. Chondroitin Sulfate is a glycosaminoglycan extracted from porcine,bovine,chicken,and shark ... cartilage. It is used for the auxiliary treatment of neural-headache, neuralgia, ... and more than 200t/year. Quality is guaranteed.Our Price is very competitive ,our quality is good ,and we can keep steady supply ...