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
110%
Rate breakdown
9903.04.6095.8%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Cyclic structure confirmation prevents acyclic classification
• Heavy metals testing critical for collagen applications
• Fermentation vs synthetic origin declaration