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Although rare, potential side effects of glucosamine supplements include: indigestion, nausea, heartburn, diarrhea, constipation, skin reactions and headaches. It’s not well known how glucosamine effects women during pregnancy or while breastfeeding, so it’s best to avoid taking supplements during those times unless being monitored. There’s also some evidence that glucosamine supplements (usually when taken in high doses) might have the potential to cause changes in cholesterol, insulin and blood sugar levels in people with diabetes or high cholesterol, so be careful if you fall into these categories and consider getting your doctor’s advice. ( 11 )