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Side effects of chitosan supplements may include constipation, nausea, and an upset stomach.
If you’re allergic to shellfish or mushrooms, you should avoid chitosan supplements.
Chitosan may also interfere with the absorption of fat-soluble vitamins such as vitamins A, D, E, and K, as well as calcium and magnesium. Therefore, chitosan supplement labels may encourage you not to take chitosan supplements at the same time as any other supplements.
Talk with a healthcare professional before taking chitosan if you’re taking any medications, including blood thinners. Chitosan may have a negative interaction with medications like warfarin. *