Levothyroxine Sodium USP Powder from China
Levothyroxine sodium USP is the sodium salt of l-thyroxine, a synthetic thyroid hormone used primarily for treating hypothyroidism. It falls under HTS 2937.90.4000 as an amino-acid derivative hormone, specifically l-thyroxine sodium, meeting Chapter 29's criteria for chemically defined organic compounds used as hormones.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.60100%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Ensure USP certification and FDA compliance; provide Certificate of Analysis (CoA) documenting purity >98% and l-thyroxine sodium identity
• Include full chemical documentation proving it meets Chapter 29 hormone definition; avoid misclassification as general amino acid
• Verify proper cold chain logistics if required; common pitfall is improper stability testing for transport