L-Triiodothyronine (Liothyronine) from China
Liothyronine is a synthetic amino acid derivative of the thyroid hormone T3, used primarily for hypothyroidism and myxedema coma treatment. Classified under HTS 2937.90.4500 as an 'other' amino-acid derivative hormone, it meets Chapter 29 requirements for separate chemically defined organic compounds.
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
9903.05.900%Articles of aluminum, of steel or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; patented pharmaceutical articles; and semiconductor articles, as provided in subdivision (f) of U.S. note 52 to this subchapter
Import Tips
• Include pharmacopeia compliance certificates (USP/EP) to confirm identity as a pure hormone derivative
• Avoid anti-dusting agents that could render it suitable for specific non-general use per Chapter 29 note (g)
• Declare exact purity levels to prevent reclassification as mixtures outside Chapter 29 scope