L-Triiodothyronine (Liothyronine)
Liothyronine, also known as L-triiodothyronine or T3, is a synthetic amino acid derivative of the thyroid hormone used primarily for treating hypothyroidism and myxedema coma. This chemically defined hormone is reproduced by synthesis and has potent metabolic effects. It is classified under 2937.90.00 as an amino-acid derivative hormone used primarily for hormonal effects.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not used primarily as a hormone
Non-hormonal derivatives of amino-acid hormones fall under 2937.19.
If imported as finished tablets or injections
Medicaments in measured doses are classified in Chapter 30.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm the product is the free base or a specific salt form as documented
• Ensure the product is not in tablet or injectable form, which would fall in Chapter 30
• Maintain records showing the primary hormonal use for classification
Related Products under Tariff item 2937.90.00
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Adrenaline hydrochloride EP grade is the hydrochloride salt of epinephrine, a catecholamine hormone, used primarily for its hormonal effects in emergency auto-injectors. As a salt of a hormone of heading 29.37, it is classified under this 'other' tariff item.
Calcitonin Salmon Recombinant
Recombinant salmon calcitonin is a synthetic polypeptide chain-modified derivative of the natural hormone calcitonin. It is used primarily for treating osteoporosis and hypercalcemia by regulating calcium metabolism. It is classified under 2937.90.00 as an amino-acid derivative hormone used primarily for hormonal effects.
Calcitonin Salmon Synthetic
Calcitonin Salmon Synthetic is a polypeptide hormone produced by chemical synthesis, used primarily in the treatment of osteoporosis and other bone disorders. As a chain-modified polypeptide hormone reproduced by synthesis, it falls under tariff item 2937.90.00, which covers hormones and their derivatives used primarily as hormones. This bulk API powder is intended for pharmaceutical manufacturing or compounding.
Desmopressin Acetate
Desmopressin acetate is a synthetic analogue of vasopressin, an antidiuretic hormone used primarily for treating diabetes insipidus. This chain-modified polypeptide is reproduced by synthesis and acts on vasopressin receptors. It is classified under 2937.90.00 as a structural analogue of hormones used primarily for hormonal effects.
DHEA (Dehydroepiandrosterone) Micronized Powder
DHEA (Dehydroepiandrosterone) Micronized Powder is a synthetic steroid hormone precursor used primarily for hormonal supplementation and as an intermediate in hormone synthesis. As a structural analogue of hormones used primarily for hormonal effects, it is classified under tariff item 2937.90.00. The micronized form is a bulk powder for nutraceutical or pharmaceutical applications.
Dobutamine Hydrochloride
Dobutamine hydrochloride is a synthetic catecholamine derivative used primarily as a hormone in cardiac stress testing and heart failure treatment. As a structural analogue of hormones of heading 29.37, it is classified under this 'other' tariff item.