levothyroxine sodium
Drug ingredientCAS 55-03-8
This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.
EPA lists this chemical as inactive, meaning no company reported making, importing or processing it in the US from 2006 to 2016.
Why supply is unknownProduction is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.
Where It Comes From
Customs basis: HS 293790 · basket
These shares come from HS customs code 293790, which covers 10 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Switzerland
- Finland
- Sweden
- Canada
- South Africa
- Netherlands
- Hungary
- Spain
- Argentina
- Israel
- Ecuador
- South Korea
- Poland
57 FDA-registered drug labelers
Why It Matters
Appears in 10 drug and cosmetic product listings (FDA).
- •Levothyroxine Sodium
- •Tirosint
- •Tirosint SOL
- •Synthroid
- •Levoxyl
- •Unithroid
- •LEVO-T
- •Euthyrox
Show all 10
- •Ermeza
- •Thyquidity
- to be discontinued
Levothyroxine Sodium Tablet
Shortage listed since July 10, 2025
Vendor Pricing
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
17 more vendors
| Vendor | Country Supplier country. Where available, shows shipping origin. When the supplier ships from a different country than where they are registered, both are shown. Most suppliers show registration country only. | $/g | Pack | Purity |
|---|---|---|---|---|
| A2B Chem LLC | United States | $7.12 | 25 g | 95% |
| AA BLOCKS | United States | $7.96 | 100 g | 95% |
| AK Scientific, Inc. | United States | $14.40 | 5 g | 98% |
| Aaron Chemicals LLC | Hong Kong | $18.64 | 25 g | 99% |
| AstaTech, Inc | United States | $19.80 | 25 g | 95% |
| Angene Chemical | China → Hong Kong | $21.36 | 25 g | 99% |
| Angene International Limited | United States | $29.20 | 5 g | 98% |
| MedKoo Biosciences, Inc | United States | $50.00 | 25 g | 98% |
| Molnova | China | $56.00 | 1 g | 99% |
| TargetMol Chemicals | China → United States | $62.00 | 1 g | 99.56% |
| MedChemExpress MCE | Sweden | $98.01 | 1 g | 99.75% |
| Labotest KG | Germany | $217.80 | 5000 mg | 90% |
| AA BLOCKS (2 weeks) | United States | $428.00 | 250 mg | 95% |
| A2B Chem LLC (2 weeks) | United States | $512.00 | 250 mg | 95% |
| Apexbio Technology LLC | United States | $1290.00 | 100 mg | 99.73% |
| Otava, Ltd. (2 weeks) | Ukraine | $2724.00 | 50 mg | 90% |
| Vitas M Chemical Limited | Hong Kong | $6250.00 | 20 mg | 90% |
Chemical Identity
Data Sources
- PubChem · compound 23666112Retrieved 2026-04-07
- EPA TSCA InventoryRetrieved 2026-04-24
- FDA Drug ShortagesRetrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
levothyroxine sodium (CAS 55-03-8) https://chemicalindependence.com/chemical/55-03-8/ PubChem: 23666112. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/23666112 EPA TSCA Inventory: CAS 55-03-8. Retrieved 2026-04-24. https://www.epa.gov/tsca-inventory FDA Drug Shortages: CAS 55-03-8. Retrieved 2026-10-04. https://www.accessdata.fda.gov/scripts/drugshortages/ US Census international trade: HS 293790 for CAS 55-03-8. Reporting year: 2024. https://usatrade.census.gov/