L-Histidine from Mexico
L-Histidine is an essential amino acid featuring imidazole ring, classified as oxygen-function amino-acid under HTS 2922.49.4950. Used in allergy medications, metal chelation, and buffering agents.
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
• Imidazole ring purity testing prevents heterocyclic misclassification
• USP/NF monograph compliance for pharmaceutical intermediates
• Moisture content <0.5% specification stability