Glucosamine and chondroitin are constituents of cartilage, a component of the joints. Dietary supplements that contain these ingredients are promoted for osteoarthritis, especially knee osteoarthritis. Osteoarthritis is the most common form of arthritis. More than 32 million adults in the United States have it.
Although a substantial amount of research has been done, it’s still uncertain whether glucosamine and chondroitin, taken separately or together, are helpful for knee osteoarthritis symptoms. Studies have had inconsistent results. There have been no major safety problems with glucosamine or chondroitin, but as with all dietary supplements, it’s a good idea to discuss them with your health care provider.
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