carbocysteine
Drug ingredientCAS 638-23-3
This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.
This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.
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 293090 · basket
These shares come from HS customs code 293090, which covers 418 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Israel
- Croatia
- Ukraine
- Slovakia
- United Arab Emirates
- Ireland
- Poland
- Lithuania
- Brazil
- Singapore
- Australia
- Armenia
- Hong Kong
- Vietnam
- Czech Republic
- Hungary
- Greece
- Russia
1 FDA-registered drug labeler
Why It Matters
Vendor Pricing
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
26 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 |
|---|---|---|---|---|
| AA BLOCKS | United States | $0.18 | 500 g | 98% |
| Angene Chemical | China → Hong Kong | $0.19 | 100 g | 98% |
| Aaron Chemicals LLC | Hong Kong | $0.20 | 25 g | 98% |
| BLD Pharmatech GmbH | Germany | $0.20 | 1 kg | 98% |
| BLD Pharmatech Ltd. | China | $0.20 | 1 kg | 98% |
| Ambeed, Inc. | United States | $0.22 | 1 kg | 98% |
| BLD Pharmatech Co., Limited | United States | $0.22 | 1 kg | 98% |
| Combi-Blocks, Inc. | United States | $0.25 | 1 kg | 97% |
| AK Scientific Specialized | United States | $0.30 | 500 g | 95% |
| AK Scientific, Inc. | United States | $0.42 | 500 g | 98% |
| Angene International Limited | United States | $0.72 | 500 g | 98% |
| ALFA AESAR | Germany | $1.85 | 100 g | 97% |
| AstaTech (2 weeks) | United States | $3.08 | 25 g | 95% |
| Sigma-Aldrich (Rush Stock) | Germany | $7.96 | 25 g | — |
| Sigma-Aldrich | Germany | $7.96 | 25 g | — |
| MedKoo Biosciences, Inc | United States | $22.00 | 25 g | 98% |
| Interbioscreen | Hong Kong | $24.00 | 10 g | 95% |
| Molnova | China | $27.00 | 1 g | 99% |
| TargetMol Chemicals | China → United States | $30.00 | 1 g | 99.93% |
| MedChemExpress MCE | Sweden | $49.61 | 1 g | 99.79% |
| Combi-Blocks (back-ordered) | United States | $432.00 | 5 g | 95% |
| Labotest KG | Germany | $453.00 | 1000 mg | 90% |
| Acrotein ChemBio, Inc. | United States | $660.00 | 1 g | — |
| A2B Chem LLC (2 weeks) | United States | $1170.00 | 100 mg | 98% |
| AA BLOCKS (2 weeks) | United States | $1240.00 | 100 mg | 98% |
| IRIS Biotech Gmbh | Germany | $4560.00 | 25 mg | — |
Chemical Identity
Data Sources
- PubChem · compound 193653Retrieved 2026-04-07
- EPA TSCA InventoryRetrieved 2026-04-24
- FDA National Drug Code directoryRetrieved 2026-04-07
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
carbocysteine (CAS 638-23-3) https://chemicalindependence.com/chemical/638-23-3/ PubChem: 193653. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/193653 EPA TSCA Inventory: CAS 638-23-3. Retrieved 2026-04-24. https://www.epa.gov/tsca-inventory FDA National Drug Code directory: bulk match. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 293090 for CAS 638-23-3. Reporting year: 2024. https://usatrade.census.gov/