Official EU label nameGlossary entry 15280

LEUCINE

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:61-90-5

EC:200-522-0

Ingredient index records:

LEUCINE

Cosmetic functions: ANTISTATIC, HAIR CONDITIONING, SKIN CONDITIONING

L-Leucine

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2 matched or reported names

LEUCINEleucine

Regulatory evidence across markets

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

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 61-90-5

CAS 61-90-5PubChem CID 6106

L-Leucine

L-leucine is the L-enantiomer of leucine. It has a role as a mouse metabolite, a Saccharomyces cerevisiae metabolite, a plant metabolite, an Escherichia coli metabolite, a human metabolite and an algal metabolite. It is a L-alpha-amino acid, a leucine, a pyruvate family amino acid and a proteinogenic amino acid. It is a conjugate base of a L-leucinium. It is a conjugate acid of a L-leucinate. It is an enantiomer of a D-leucine. It is a tautomer of a L-leucine zwitterion. — ChEBI

IUPAC name: (2S)-2-amino-4-methylpentanoic acid

Molecular formula: C6H13NO2
Molecular weight: 131.17 g/mol
Exact mass: 131.094628657 Da
XLogP3: -1.5
Topological polar surface area: 63.3 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 1

Also known as

leucine(S)-2-Amino-4-methylpentanoic acid(S)-Leucine(S)-(+)-LeucineLeucin(S)-2-Amino-4-methylvaleric acidL-alpha-Aminoisocaproic acidLEUCINE, L-

16 more reported names

LeucinumLeucinaFEMA No. 3297(2S)-alpha-leucineL-leucin2-amino-4-methylvaleric acidL-(-)-2-Amino-4-methylpentanoic acidalpha-Aminoisocaproic acidL-LeuzinLeucine, lNSC-46709(2S)-alpha-2-amino-4-methylvaleric acidGMW67QNF9CL-LeuCHEBI:15603(2S)-2-amino-4-methylpentanoate

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External database identifiers

ChEBI:CHEBI:15603
ChEMBL:CHEMBL291962
EPA DTXSID:DTXSID9023203
PubMed:40885242
PubMed:31676321
PubMed:29968805
PubMed:28786956
PubMed:24125484
PubMed:23125742
PubMed:23124343
PubMed:23113206
PubMed:23109933
PubMed:23108620
PubMed:23107525
PubMed:23107499

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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