GS-500 and Chondroitin is the first product to combine Enzymatic Therapy's popular GS-500 glucosamine sulfate with low molecular weight, marine-source chondroitin sulfate. The result is a highly absorbable formula offering ultimate support for joints and cartilage.Our chondroitin sulfate has an average molecular weight less than 16,000 daltons - less than half the molecular weight of most chondroitin products. This results in improved absorption.