L-Thyroxine Sodium
L-Thyroxine sodium is the synthetic sodium salt of thyroxine, a thyroid hormone amino acid derivative used primarily for treating hypothyroidism. This chemically defined compound is reproduced by synthesis and exerts hormonal effects on metabolism. It is classified under 2937.90.00 as an amino-acid derivative hormone used primarily for hormonal therapy.
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
Other hormone derivatives not primarily hormonal fall under 2937.19.
If mixed with other active ingredients
Medicaments containing multiple active substances 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
• Provide a Certificate of Analysis confirming the L-isomer and sodium salt form
• Ensure the product is not mixed with excipients or put up in dosage units
• Confirm the end-use is hormonal therapy to support classification under 2937.90.00
Related Products under Tariff item 2937.90.00
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