Glucosamine is an essential, endogenous amino acid sugar with high structural viscosity (malleability), and is a precursor of hyaluronic acid. Glucosamine is considered the main building block for the synthesis of proteoglycans. D-glucosamine sulfate is the bioactive sulfuric acid salt of the aminosaccharide D-glucosamine and, unlike glucosamine HCl, contains organically bound sulfur.
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