Official EU label nameGlossary entry 18407

ORNITHINE

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:70-26-8

EC:200-731-7

Ingredient index records:

ORNITHINE

Cosmetic functions: SKIN CONDITIONING

Pentanoic acid, 2,5-diamino-, (S)-

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2 matched or reported names

ORNITHINEornithine

Regulatory evidence across markets

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

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 70-26-8

CAS 70-26-8PubChem CID 6262

L-(-)-Ornithine

L-ornithine is an optically active form of ornithine having L-configuration. It has a role as a hepatoprotective agent, a mouse metabolite and an algal metabolite. It is an ornithine and a non-proteinogenic L-alpha-amino acid. It is a conjugate base of a L-ornithinium(1+). It is a conjugate acid of a L-ornithinate. It is an enantiomer of a D-ornithine. — ChEBI

IUPAC name: (2S)-2,5-diaminopentanoic acid

Molecular formula: C5H12N2O2
Molecular weight: 132.16 g/mol
Exact mass: 132.089877630 Da
XLogP3: -4.4
Topological polar surface area: 89.3 Å²
Hydrogen-bond donors: 3
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 1

Also known as

L-ornithineornithine(S)-2,5-Diaminopentanoic acid(S)-Ornithine(S)-2,5-diaminovaleric acid(S)-alpha,delta-Diaminovaleric acidOrnitina(+)-S-Ornithine

16 more reported names

Ornithinum(S)-2,5-DiaminopentanoateNSC-758894E524N2IXA3CHEBI:15729CHEBI:18257RefChem:8569232,5 Diaminopentanoic AcidA05BA06(2S)-2,5-diaminopentanoate;hydron200-731-72,5-Diaminopentanoate2,5-Diaminovaleric acidOrnithine [INN]Ornithinum [Latin]Ornitina [Spanish]

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External database identifiers

ChEBI:CHEBI:15729
ChEMBL:CHEMBL446143
EPA DTXSID:DTXSID00883219
PubMed:29968805
PubMed:23122508
PubMed:23122502
PubMed:23116672
PubMed:23105849
PubMed:23105814
PubMed:23082535
PubMed:23071598
PubMed:23038227
PubMed:23031436
PubMed:23024808
PubMed:22998630

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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