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並前往https://www3.epa.gov/pesticides/chem_search/reg_actions/registration/fs_PC-128991_1-Mar-01.pdf

Chitin; Poly-N-acetyl-D-glucosamine (128991) Fact Sheet

The active ingredient is isolated from the shells of crustaceans, especially crabs and shrimp. Given its lack of toxicity, chitin is not expected to harm people ...

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