cystine
Drug ingredientCAS 56-89-3
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
3 FDA-registered drug labelers
Why It Matters
Appears in 2 drug and cosmetic product listings (FDA).
- •N-17
- •E.O.L.
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 |
|---|---|---|---|---|
| Combi-Blocks, Inc. | United States | $0.39 | 500 g | 97% |
| AA BLOCKS | United States | $0.45 | 500 g | 98% |
| Aaron Chemicals LLC | Hong Kong | $0.48 | 100 g | 98% |
| Chemscene | United States | $0.51 | 500 g | — |
| Angene Chemical | China → Hong Kong | $0.53 | 100 g | 98% |
| MedChemExpress MCE | Sweden | $0.64 | 500 g | 98% |
| Fluorochem EU | Germany | $0.76 | 100 g | 95% |
| BLD Pharmatech Co., Limited | United States | $1.43 | 100 g | 98% |
| BLD Pharmatech GmbH | Germany | $1.43 | 100 g | 98% |
| BLD Pharmatech Ltd. | China | $1.43 | 100 g | 98% |
| Ambeed, Inc. | United States | $1.43 | 100 g | 98% |
| Acrotein ChemBio, Inc. | United States | $1.67 | 250 g | — |
| AK Scientific, Inc. | United States | $2.80 | 25 g | 98% |
| AstaTech (2 weeks) | United States | $3.99 | 100 g | 97% |
| Fulfilled by Molport | Latvia | $5.00 | 1 g | — |
| Angene International Limited | United States | $5.72 | 25 g | 98% |
| Molnova | China | $43.00 | 1 g | 99% |
| TargetMol Chemicals | China → United States | $145.00 | 200 mg | — |
| ChemNorm | China | $150.00 | 100 mg | 98% |
| Labotest KG | Germany | $453.00 | 1000 mg | 90% |
| Otava, Ltd. | Ukraine | $2280.00 | 50 mg | 95% |
| Otava, Ltd. (2 weeks) | Ukraine | $2724.00 | 50 mg | 90% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 98% |
| Princeton BioMolecular Research (SC) | United States | $8000.00 | 15 mg | 90% |
| Vitas M Chemical Limited | Hong Kong | $9000.00 | 10 mg | 90% |
| TimTec, LLC (back-ordered) | United States | $32000.00 | 15 mg | 94% |
Chemical Identity
Data Sources
- PubChem · compound 67678Retrieved 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
cystine (CAS 56-89-3) https://chemicalindependence.com/chemical/56-89-3/ PubChem: 67678. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/67678 EPA TSCA Inventory: CAS 56-89-3. 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 56-89-3. Reporting year: 2024. https://usatrade.census.gov/