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Glucosamine (C6H14NO5) is a dietary supplement distributed as a salt -- commonly, but not limited to, glucosamine HCl, glucosamine sulfate potassium, and glucosamine sulfate sodium. Common dosages of glucosamine are 1,500mg per day. The salt (e.g. Glucosamine Sulfate * KCL, Glucosamine Sulfate * NACL) forms should be avoided as up to 30% of the actual glucosamine is replaced with cheap and ineffective filler.
Current research shows it may play a role in relieving pain associated with osteoarthritis. As used, it is often paired with MSM. The National Institute of Health is, as of 2004, conducting a study to see the effects of chondroitin and glucosamine on osteoporosis and osteoarthritis.
More information:
Glucosamine and Arthritis Center (http://www.glucosamine-arthritis.org) - Hundreds of articles about arthritis and glucosamine as well as plain english scientific summaries, discussion forums and reviews.
For further information on The Lancet study see this summary of reasearch info on Glucosamine Sulfate (http://www.sheffield800.freeserve.co.uk/glucosamine/)
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