What is Glucosamine? (Mayo Clinic)
Glucosamine Info (UMM.edu)
Arthritis & Glucosamine Information Center (AGIC)
How Glucosamine Helps Osteoarthritis (Spine-Health.com)
More on Glucosamine and Arthritis (WebMD.com)
Glucosamine and Chondroitin (Andrew Weil, M.D.)