L-Thyroxine Sodium from Canada
L-Thyroxine sodium is the synthetic sodium salt of thyroxine, a thyroid hormone amino acid derivative used primarily for treating hypothyroidism. It falls under HTS 2937.90.4500 as an amino-acid derivative used primarily as a hormone, fitting Chapter 29's scope for chemically defined organic compounds with hormonal function.
Duty Rate — Canada → United States
0%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Obtain FDA approval and provide certificates of analysis confirming purity as a chemically defined hormone derivative
• Ensure proper pharmaceutical labeling and Drug Master File (DMF) registration to avoid classification disputes
• Verify stability data for transport, as Chapter 29 allows stabilizers only for preservation without altering use