Chitosan, a type of sugar extracted from the exoskeletons of shrimp, lobster and other shellfish, has a history of use for wound healing, gum disease, Crohn's disease, weight loss and high cholesterol. WebMD notes most of these uses have insufficient evidence to support chitosan's efficacy. While generally considered safe, certain circumstances preclude this sugar's use, and it does carry the risk of certain side effects.
Allergic Reaction
A patient with an allergy to shellfish might experience an allergic reaction to this supplement. The allergy, however, stems from the actual fish and not the shell, so whether or not chitosan would trigger this same reaction definitively has not been established. WebMD notes some medical experts doubt that it would prove problematic. If you have a shellfish allergy, talk to your doctor before supplementing and be on the lookout for signs of an allergic reaction such as swelling, itching, hives, watery eyes and trouble breathing.
Side Effects
Noted side effects appear to be of the gastrointestinal variety. Possible reactions include constipation, gas and gastrointestinal upset. Chitosan might also inhibit your body's ability to absorb the fat-soluble vitamins A, D, E and K.
Pregnancy and Breast-feeding
Whether or not you can safely use this supplement during pregnancy or breast-feeding has not been determined. Memorial Sloan Kettering Cancer Center cautions against use due to its potential to block the absorption of nutrients necessary for a healthy pregnancy. In these instances, avoiding chitosan supplementation appears to be in your best interest.
Medication Interactions
Chitosan supplements might slow the amount of time it takes for blood to clot. You should not use this supplement if you are currently taking blood-thinning medications like Coumadin.
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