That's the conclusion of a study, called GAIT (Glucosamine/chondroitin Arthritis Intervention Trial), sponsored by the National Institute for Complementary and Alternative Medicine, as reported today by Reuters. Here's a segment of that report:
The original GAIT study results in 2006 found the supplements did not reduce the pain of knee arthritis, except among a small group of patients with moderate to severe pain.
The GAIT researchers continued to watch 572 volunteers for another 18 months and found the supplements did not appear to slow the loss of cartilage, taken either alone or together.
They said arthritis worsened in 24 percent of participants taking both, similar to those taking placebo.
"Research continues to reveal that osteoarthritis, the most common form of arthritis, appears to be the result of an array of factors including age, gender, genetics, obesity, and joint injuries," said Dr. Stephen Katz, director of the NIH's National Institute of Arthritis and Musculoskeletal and Skin Diseases.
You can find the original study summary here.