Official EU label nameGlossary entry 5460

CARBOCYSTEINE

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

0 markets with evidence

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Markets with evidence

Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:638-23-3

EC:211-327-5

Ingredient index records:

CARBOCYSTEINE

Cosmetic functions: ANTI-SEBUM, SKIN CONDITIONING

L-Cysteine, S-(carboxymethyl)-

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2 matched or reported names

CARBOCYSTEINEcarbocysteine

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name CARBOCYSTEINE.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 638-23-3

CAS 638-23-3PubChem CID 193653

Carbocysteine

S-carboxymethyl-L-cysteine is an L-cysteine thioether that is L-cysteine in which the hydrogen of the thiol group has been replaced by a carboxymethyl group. It has a role as a mucolytic. It is a L-cysteine thioether and a non-proteinogenic L-alpha-amino acid. It is a conjugate acid of a S-carboxylatomethyl-L-cysteine(1-). — ChEBI

IUPAC name: (2R)-2-amino-3-(carboxymethylsulfanyl)propanoic acid

Molecular formula: C5H9NO4S
Molecular weight: 179.20 g/mol
Exact mass: 179.02522894 Da
XLogP3: -3.1
Topological polar surface area: 126.0 Å²
Hydrogen-bond donors: 3
Hydrogen-bond acceptors: 6
Covalent units: 1
Defined stereocentres: 1

Also known as

CarbocisteineS-Carboxymethyl-L-cysteineS-(CARBOXYMETHYL)-L-CYSTEINEcarbocisteinMucodyneRhinathiolTransbronchinLisomucil

16 more reported names

MuciclarMucolaseReomucilMucocisSiroxylMucolexCarbocisteinaCarbocitMucofanMucoprontl-carbocysteinePectoxL-Carbocisteine(R)-S-(Carboxymethyl)cysteineCarbocisteinumMethista

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External database identifiers

ChEBI:CHEBI:16163
ChEMBL:CHEMBL396416
EPA DTXSID:DTXSID30110060
PubMed:24998638
PubMed:24269501
PubMed:24076166
PubMed:23045014
PubMed:22497630
PubMed:22332001
PubMed:21950673
PubMed:21890513
PubMed:21782562
PubMed:21636230
PubMed:21621508
PubMed:21559953

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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