Doctor's Best Vegan Glucosamine Chondroitin MSM contains a unique combination of Green Grown 100% vegetable sourced glucosamine, highest purity of OptiMSM. Vegan chondroitin provides greater concentration and 43% higher absorption than chondroitin sulfate of animal origin. This product supplies the building material for proteoglycans, which support joint structure and function. It also provides sulfur, the key element for joint, hair, skin, and nail health. p>