Riboflavin Vitamin B2 Phosphate Tablets from China
Riboflavin-5'-phosphate sodium (synthetic B2 from aromatic lumiflavin) 400mg tablets for migraine prophylaxis, retail doses. Under HTS 3004.50.40.00 for measured synthetic vitamins.
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
• Light-stability packaging required for flavins
• Phosphate ester confirmation via HPLC
• Avoid food colorant claims