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Vitamins Information (Home) > Side Effects > Glucosamine Glucosamine Side EffectsAt the amount most frequently taken by adults 500 mg three times per day of GS adverse effects have been limited to mild reversible gastrointestinal side effects. In one trial, people with peptic ulcers and those taking diuretic drugs were more likely to experience side effects. Animal research has raised the possibility that glucosamine could contribute to insulin resistance. This effect might theoretically result from the ability of glucosamine to interfere with an enzyme needed to regulate blood sugar levels. However, available evidence does not suggest that taking glucosamine supplements will trigger or aggravate insulin resistance or high blood sugar. Two large, 3-year controlled trials found that people taking GS had either slightly lower blood glucose levels or no change in blood sugar levels, compared with people taking placebo. Until more is known, people taking glucosamine supplements for long periods may wish to have their blood sugar levels checked; people with diabetes should consult with a doctor before taking glucosamine and should have blood sugar levels monitored if they are taking glucosamine. In 1999 the first case of an allergic reaction to oral GS was reported. Allergic reactions to this supplement appear to be rare. Some GS is processed with sodium chloride (table salt), which is restricted in some diets (particularly for people with high blood pressure). The theory that GS and chondroitin sulfate work synergistically in the treatment of osteoarthritis remains unproven. At the time of writing, there were no well-known drug interactions with glucosamine.
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