From the Manufacturer:
Chondroitin sulfate is the bulk of the matrix that builds vertebral discs, ligaments, cartilage and other connective tissues. Made from purified bovine tracheal tissue, chondroitin sulfate is highly effective in recovery from injury. It can speed up healing time, reduce pain, and provide cushioning to sore, traumatized areas. Particularly useful in broken bones, torn ligaments and tendons, as well as in more extended articular pain conditions.