Glucosamine is present in chitin from the shells of prawns and other crustaceans. As a supplement, glucosamine is derived from marine exoskeletons or produced synthetically and is available in salt forms, including glucosamine sulfate, glucosamine
hydrochloride, glucosamine hydroiodide and N-acetyl glucosamine. Glucosamine salts are likely to be completely ionised in the stomach, although clinical equivalence of the different salts has not been established. The purity and content of products has been questioned in the USA, where glucosamine is regarded as a food supplement and its quality is unregulated (Consumer-labs).
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