N-acetyl glucosamine (NAG) is an amino acid sugar that is formed from glucosamine and is an endogenous precursor of hyaluronic acid. NAG is the main building block for the synthesis of proteoglycans, which are an important component of connective tissue, especially cartilage tissue, but also play an important role in the intestinal barrier. The production of glucosamine and cartilage progressively decreases with age.
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