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Chitosan
Chitosan
Low concern
Chitosan from fungal sources has FDA GRAS notices (e.g., GRN 397, 443). Generally well tolerated; may cause GI side effects and is a shellfish-allergen risk if from crustaceans.
Found in
5 products
What it is
A polysaccharide (deacetylated chitin) derived from crustacean shells or fungi; used as a fiber, weight-loss supplement, and clarifying agent.
Soluble fiber/binder; clarifier in beverages; weight-management ingredient.
Why it's flagged
- shellfish-allergen exposure if crustacean-derived
- may bind fat-soluble vitamins/medications
What regulators actually say
"GRN 397 — Fungal chitosan: FDA had no questions regarding the GRAS status for use as an ingredient in foods."
Regulatory status
United States — FDA
GRAS (no questions) for fungal chitosan, e.g., GRN 397, 443
European Union — EFSA
Authorized health claim for chitosan and blood cholesterol
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