Thiamine Allyl Disulfide from China
Thiamine allyl disulfide (TAD) is a lipophilic B1 derivative naturally found in garlic, used in nutritional supplements. Classified under HTS 2936.22.00.00 for its primary vitamin function despite organo-sulfur structure. Provides garlic-like bioavailability enhancement.
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
• Allergen declaration for garlic sensitivity required on labels
• GC-MS testing for allyl sulfide purity to distinguish from food extracts
• Declare natural/synthetic origin to guide FDA jurisdiction