Description Description Doctor's Best Vegan Glucosamine Chondroitin MSM (GCMSM) contains three ingredients known to support healthy joints and joint function: glucosamine, chondroitin and MSM (methylsulfonylmethane). This unique combination uses GreenGrown® 100% vegetable source glucosamine sulfate, highest purity OptiMSM®, and Mythocondro®, the first formulation to contain non-animal chondroitin sulfate. Non-animal derived chondroitin provides greater concentration and 43% higher absorption than chondroitin sulfate of animal origin.