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L-Proline from Mexico

L-Proline is a non-essential amino acid with pyrrolidine ring, oxygen-function amino-acid under HTS 2922.49.4950. Key in collagen synthesis supplements and pharmaceutical intermediates.

Duty Rate — Mexico → United States

14.2%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

Import Tips

Cyclic structure confirmation prevents acyclic classification

Heavy metals testing critical for collagen applications

Fermentation vs synthetic origin declaration