Many glucosamine supplements for dogs also contain chondroitin sulfate, another compound found in cartilage. Chondroitin ...

While chondroitin sulfate and glucosamine sulfate both have well-documented, beneficial effects in patients with osteoarthritis, the exact molecular actions of these drugs are also unknown.

If you experience joint pain you may be tempted by supplements such as glucosamine and chondroitin, which are often taken together, or omega-3 pills such as fish oil. Last year, U.S. consumers ...