If you're among the estimated 27 million Americans who suffer from osteoarthritis of the knee or hip, then perhaps you've tried the nutritional supplements glucosamine and chondroitin. They've been marketed for joint health for about 20 years, and sales are still brisk. But do they help?
Some horses might say yes. The supplements were first tried in horses, and there's some evidence that the supplements might improve joint function for them.