Mild side effects: Glucosamine is an amino sugar that is often taken as a nutritional supplement for arthritis. In several large clinical trials the side effects were mild and infrequent consisting of constipation, stomach ache, rash and hives. Since glucosamine is often made from the shells of crustaceans there is a theoretical risk of an allergic reaction for those with seafood allergies, but is rarely seen.
Answered 3/21/2015
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