PCA
L-2-Pyrrolidone-5-carboxylic acid
PCA is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.
Regulatory evidence by market
No rule for this ingredient has been imported for any of the 13 markets tracked here.
That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.
Chemical identity and properties
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 Ų
- Hydrogen-bond donors
- 2
- Hydrogen-bond acceptors
- 3
- Covalent units
- 1
- Defined stereocentres
- 1
Also known as
16 more reported names
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.
Inventory details for PCA
INCI name
PCA
INN name
pidolic acid
Description
L-2-Pyrrolidone-5-carboxylic acid
Record provenance
- Inventory reference
- 77186
- Imported identity
- PCA
- Source update
- 15/10/2010
Annex records for PCA
Key data
- HUMECTANT
- Retaining and/or preserving the moisture in a product during use.
- MOISTURISING
- Increasing the water content of the skin and keeping it soft and smooth.
Official EU ingredient-name evidence
The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.
Related inventory evidence
Ingredients with overlapping formulation functions
Additional official and scientific sources
11 external databases to check this identity in
Each link searches that source for this identity. What each source is, and its legal weight
How PCA appears in the CosIng inventory
The CosIng inventory lists PCA as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.
PCA is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.
Frequently asked questions
Source note for PCA
This page reproduces the CosIng inventory entry for PCA from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.
Use this inventory page to research PCA and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.
Tools & next steps
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