L-Phenylalanine from Mexico
L-Phenylalanine is an essential aromatic amino acid explicitly named in HTS 2922.49.10.00, featuring both amino and carboxylic acid groups. Widely used in nutritional supplements, pharmaceuticals, and as a sweetener precursor (aspartame). Meets criteria for oxygen-function amino-acids.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6094.2%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
• Specify L-enantiomer with optical rotation data (CAS 63-91-2)
• For food use, provide Kosher/Halal certs and amino acid purity >98.5%
• Segregate from D-isomer to avoid racemic mixture reclassification