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Glucosamine is often sold in combination with other supplements such as chondroitin sulfate and methylsulfonylmethane. [ citation needed ] Glucosamine, along with commonly used chondroitin, is not routinely prescribed to treat people who have symptomatic osteoarthritis of the knee, as there is insufficient evidence that this treatment is helpful.
A significant amount of research has been performed on glycosaminoglycans, especially glucosamine and chondroitin, for the treatment of arthritis.These compounds are commonly marketed as nutritional supplements and numerous 'soft therapeutic claims' are made about their health benefits - especially in aging populations. [1]
It is a secondary amide between glucosamine and acetic acid. It is significant in several biological systems. It is part of a biopolymer in the bacterial cell wall, which is built from alternating units of GlcNAc and N-acetylmuramic acid (MurNAc), cross-linked with oligopeptides at the lactic acid residue of MurNAc.
Members of the glycosaminoglycan family vary in the type of hexosamine, hexose or hexuronic acid unit they contain (e.g. glucuronic acid, iduronic acid, galactose, galactosamine, glucosamine). They also vary in the geometry of the glycosidic linkage. Examples of GAGs include:
Chemical structure of one unit in a chondroitin sulfate chain. Chondroitin-4-sulfate: R 1 = H; R 2 = SO 3 H; R 3 = H. Chondroitin-6-sulfate: R 1 = SO 3 H; R 2, R 3 = H.. Chondroitin sulfate is a sulfated glycosaminoglycan (GAG) [1] composed of a chain of alternating sugars (N-acetylgalactosamine and glucuronic acid).
Chondroitin as a supplement is now commonly used (often in combination with glucosamine) in treating the joint disease of osteoarthritis. [2] In contrast to the symptomatic treatments, chondroitin can modify the progression of a disease process in the patient which it can be used as an alternative medicine. [ 2 ]
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