It may take at least 4 weeks of taking glucosamine consistently before you notice any improvement. If your symptoms worsen while taking glucosamine, contact your health care provider.
Glucosamine appears to be safe for most people. Common side effects include gas, nausea, heartburn, diarrhea, and constipation.
Talk to your health care professional before using glucosamine if you are taking an anticoagulant medication such as warfarin. Glucosamine may increase the effect of warfarin and the risk of bleeding.
There have been concerns that glucosamine may raise blood sugar in people with diabetes, but this is not supported by reliable research. People with diabetes should use glucosamine with caution and monitor their blood sugar levels.
Since glucosamine is produced from shells of shrimp, lobster, and crab, people with shellfish allergy should avoid it.
You should consult a health care practitioner before taking glucosamine if you are pregnant or breast-feeding.
Before taking any new medications, including natural health products, speak to your physician, pharmacist, or other health care provider. Tell your health care provider about any natural health products you may be taking.