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The European Food Safety Authority’s Panel on Dietetic Products, Nutrition, and Allergies set the maximum recommended daily intake of chitosan at 3 grams. There is currently no recommended maximum amount established in the United States.
While studies have shown chitosan supplementation to be generally safe in adults, the doses studied range widely, from 0.34–3.4 grams of chitosan per day.
Therefore, there’s no consensus on the most effective dose for chitosan. But staying below that 3-gram maximum set by European safety authorities may be a good reference. *