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Cystine

Drug ingredient

CAS 923-32-0

This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.

Molecular structure of 923-32-0
US productionNot reported
Import value, 2024$760M
Top sourceChina 33%

This chemical is not on EPA’s Toxic Substances Control Act inventory, the list behind EPA’s production survey.

Why supply is unknown

Production 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.

Source Countries
CN 33%ChinaES 14%SpainCH 9%SwitzerlandIT 7%ItalyIN 7%India
3 FDA-registered drug labelers
DNA Labs, Inc.
InLight Creation, LLC.
PharmaZell GmbH

Why It Matters

Sectors
Health
Downstream Uses

Appears in 2 drug and cosmetic product listings (FDA).

  • •N-17
  • •E.O.L.
FDA Shortage Status
No FDA shortage records

Chemical Identity

CAS923-32-0
PubChem CIDNot recorded
DTXSIDDTXSID50859005
FormulaC6H12N2O4S2
Mol. Weight240.29 g/mol
SMILESNC(CSSCC(N)C(O)=O)C(O)=O

Data Sources

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Brief citations

Cystine (CAS 923-32-0) https://chemicalindependence.com/chemical/923-32-0/ EPA CompTox (DSSTox): 923-32-0. Retrieved 2026-04-29. https://comptox.epa.gov/dashboard/chemical/details/DTXSID50859005 FDA National Drug Code directory: CAS 923-32-0. Retrieved 2026-10-04. https://open.fda.gov/data/ndc/ US Census international trade: HS 293090 for CAS 923-32-0. Reporting year: 2024. https://usatrade.census.gov/