In this new study completed at the University of Montreal Hospital Research Centre, chondroitin sulphate, at a dosage of 800 mg daily, reduced cartilage volume loss in knee osteoarthritis patients starting as early as 6 months after initiation of therapy. See http://www.raysahelian.com/chondroitin.html for details. As you may know, glucosamine and chondroitin are popular supplements used by many older individuals to prevent or reduce symptoms of osteoarthritis.