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
6.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 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