Thiamine Hydrochloride (Vitamin B1) from Mexico
Thiamine hydrochloride contains a substituted pyrimidine-thiazolium structure with an unfused aromatic thiazole ring, classified as a vitamin but tariffed as its heterocyclic component. Falls under HTS 2934.10.20.00 as 'other' aromatic thiazole compound per Chapter 29 precedence. The thiazole ring determines classification over vitamin function.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Include USP/NF certificate confirming thiazole content despite vitamin labeling
• FDA registration required; declare pharmaceutical grade to avoid food supplement reclassification
• Specify 'thiazole derivative' on commercial invoice to support HTS 2934.10 classification