Official EU label nameGlossary entry 19139

PCA

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.

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Resolved identifiers

Resolved substance identity

CAS:98-79-3

EC:202-700-3

Ingredient index records:

PCA

Cosmetic functions: HUMECTANT, MOISTURISING

L-2-Pyrrolidone-5-carboxylic acid

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2 matched or reported names

PCApidolic acid

Regulatory evidence across markets

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

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 98-79-3

CAS 98-79-3PubChem CID 7405

L-Pyroglutamic Acid

5-oxo-L-proline is an optically active form of 5-oxoproline having L-configuration. It has a role as an algal metabolite. It is a 5-oxoproline, a non-proteinogenic L-alpha-amino acid and a L-proline derivative. It is a conjugate acid of a 5-oxo-L-prolinate. It is an enantiomer of a 5-oxo-D-proline. — ChEBI

IUPAC name: (2S)-5-oxopyrrolidine-2-carboxylic acid

Molecular formula: C5H7NO3
Molecular weight: 129.11 g/mol
Exact mass: 129.042593085 Da
XLogP3: -0.8
Topological polar surface area: 66.4 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 1

Also known as

Pyroglutamic acidPidolic acid5-oxo-L-prolinepyrogluGLUTIMIC ACID(S)-(-)-2-Pyrrolidone-5-carboxylic acid5-L-OxoprolineL-Proline, 5-oxo-

16 more reported names

L-5-OxoprolinePidolidone(S)-PYROGLUTAMIC ACIDAJIDEW A-100(-)-2-Pyrrolidone-5-carboxylic acidAcide pidoliqueAcido pidolico5-Carboxy-2-pyrrolidinoneL-pca2-Pyrrolidinone-5-carboxylic acidL-5-Carboxy-2-pyrrolidinone(S)-5-Oxo-2-pyrrolidinecarboxylic acidL-5-Oxo-2-pyrrolidinecarboxylic acidGLUTIMINIC ACIDL-Pyroglutamate5-Pyrrolidinone-2-carboxylic acid

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External database identifiers

ChEBI:CHEBI:18183
ChEMBL:CHEMBL397976
EPA DTXSID:DTXSID6046260
PubMed:24391398
PubMed:24111553
PubMed:22970285
PubMed:22958103
PubMed:22897232
PubMed:22781366
PubMed:22701303
PubMed:22685457
PubMed:22654860
PubMed:22654853
PubMed:22649652
PubMed:22649400

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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