http://nccam.nih.gov/research/results/gait/qa.htm
National Center for Complementary and Alternative Medicine, National Institutes of Health
This fact sheet is a backgrounder on Glucosamine/chondroitin Arthritis Intervention Trial (GAIT), the first, large-scale, multicenter clinical trial in the United States to test the effects of the dietary supplements glucosamine hydrochloride (glucosamine) and sodium chondroitin sulfate (chondroitin sulfate) for treatment of knee osteoarthritis. The study tested whether glucosamine and chondroitin sulfate used separately or in combination reduced pain in participants with knee osteoarthritis.