Thiamine Hydrochloride (Vitamin B1) from Mexico
Thiamine hydrochloride contains a substituted pyrimidine-thiazolium structure with an unfused thiazole ring, classified as a vitamin but chemically under thiazole compounds in HTS 2934.10.90.00. This subheading captures complex thiazoles used primarily as pharmaceuticals, consistent with Chapter 29's precedence for heterocyclic classification.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%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
• Include USP/NF certificate of analysis confirming pharmaceutical grade specifications
• Pre-register with FDA for bulk vitamin actives; provide DMF reference if available
• Label shipments clearly as 'Pharmaceutical Intermediate - Not for Direct Human Consumption' to avoid drug classification