Prosultiamine Vitamin B1 Derivative from China
Prosultiamine is a prodrug ester of thiamine with high lipid solubility for neurological applications. Falls under HTS 2936.22.00.00 as a derivative primarily used as vitamin B1 in therapeutics. Japanese pharmacopeia standard for B1 deficiency.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.860%Universal product exemption (U.S. note 52(b))
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• NADA filing required if veterinary neurological use intended
• Provide hydrolysis rate data showing thiamine release profile
• Separate from cosmeceutical shipments to avoid Chapter 33 scrutiny