American Academy of Orthopaedic Surgeons strong scientific evidence https://nccih.nih.gov/research/results/gait/qa.htm American Academy of Orthopaedic Surgeons https://nccih.nih.gov/research/results/gait/qa.htm Glucosamine/Chondroitin Arthritis Intervention Trial (GAIT) https://nccih.nih.gov/research/results/gait/qa.htm https://nccih.nih.gov/research/results/gait/qa.htm https://nccih.nih.gov/research/results/gait/qa.htm American Academy of Orthopaedic Surgeons A large study conducted by the National Institutes of Health American Academy of Orthopaedic Surgeons A large study conducted by the National Institutes of Health American Academy of Orthopaedic Surgeons Glucosamine and Chondroitin https://nccih.nih.gov/research/results/gait/qa.htm https://nccih.nih.gov/research/results/gait/qa.htm independent study Glucosamine/Chondroitin Arthritis Intervention Trial estimated 27 million adults American Academy of Orthopaedic Surgeons Clinical trials https://nccih.nih.gov/research/results/gait/qa.htm