Thymosin Alpha-1 Powder from China
Synthetic thymosin alpha-1, a polypeptide hormone used primarily for immune modulation. Falls under HTS 2937.90.90.00 as a hormone derivative used primarily as a hormone. Research-grade bulk powder.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals: 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
• Include Institutional Review Board (IRB) approval if for clinical research
• Document synthetic origin to distinguish from biological extracts
• Lyophilized form requires humidity-controlled packaging and documentation