Caution:
There is concern that use of N-acetyl glucosamine products derived from exoskeletons of of shrimp, lobster, and crab might cause reactions in people allergic to shellfish, although no reactions have been reported as of August 2009. Until more is known, and because the source of N-acetyl glucosamine products is not listed on product labels, use N-acetyl glucosamine with caution in people with shellfish allergy. There is also some evidence that patients with shellfish allergy can safely take glucosamine products.

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