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