Both thiamine hydrochloride and thiamine mononitrate are salt forms of thiamine (Vitamin B1) and are classified together under 2936220000 — the heading does not subdivide by salt form at the 10-digit level. The distinction matters commercially because the two forms have different stability profiles and are preferred for different applications (mononitrate for dry food fortification, hydrochloride for aqueous pharmaceutical preparations), but this does not affect tariff classification. Importers should ensure the specific salt form is accurately described on the commercial invoice for FDA admissibility and labeling compliance.

Because China accounts for the large majority of global thiamine production capacity, supply disruptions — whether from regulatory shutdowns, energy constraints, or export policy changes — can rapidly affect US availability and pricing. Importers sourcing from Germany or Japan as secondary suppliers typically pay a premium for pharmaceutical-grade material but gain geographic diversification. Building safety stock and qualifying multiple suppliers across at least two source countries is a common risk-mitigation strategy for food and pharma manufacturers dependent on this vitamin.