Official EU label nameGlossary entry 13778

ISOLEUCINE

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:73-32-5443-79-8

EC:200-798-2207-139-8

Ingredient index records:

ISOLEUCINE

Cosmetic functions: ANTISTATIC, HAIR CONDITIONING, SKIN CONDITIONING

L-Isoleucine; DL-allo-Isoleucine; 2-Amino-3-methylpentanoic acid

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2 matched or reported names

ISOLEUCINEisoleucine

Regulatory evidence across markets

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

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 443-79-8

CAS 443-79-8PubChem CID 791

2-Amino-3-methylpentanoic acid

2-amino-3-methylpentanoic acid is a branched chain amino acid that consists of 3-methylpentanoic acid bearing an amino substituent at position 2. It is a branched-chain amino acid and an alpha-amino acid. — ChEBI

IUPAC name: 2-amino-3-methylpentanoic acid

Molecular formula: C6H13NO2
Molecular weight: 131.17 g/mol
Exact mass: 131.094628657 Da
XLogP3: -1.7
Topological polar surface area: 63.3 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 0

Also known as

CHEBI:38264RefChem:463945DL-ISOLEUCINE2-amino-3-methyl-pentanoic acidH-DL-allo-Ile-OHIsoleucine, DL-3107-04-8DL-2-Amino-3-methylpentanoic acid

16 more reported names

Isoleucine, allo-Isoleucine, threo-L-Isoleucine, allo-L-Isoleucine, threo-L(+)-Isoleucine(2S,3S)-Alpha-amino-beta-merthylvalericacidNSC-9958Pentanoic acid, [S-(R*,R*)]-FD3037(dl)-isoleucineIsoleucine #NSC-206282(rac)-IsoleucineNorvaline, threo-AS-49219(2r,3r)-2-amino-3-methyl-pentanoic acid

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External database identifiers

ChEBI:CHEBI:38264
EPA DTXSID:DTXSID80901480
PubMed:22572786
PubMed:22479568
PubMed:22291968
PubMed:22087350
PubMed:21949647
PubMed:21829349
PubMed:21573071
PubMed:21269446
PubMed:21107576
PubMed:20849675
PubMed:20686667
PubMed:20668018

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

PubChem 2D chemical structure for CAS 73-32-5

CAS 73-32-5PubChem CID 6306

L-Isoleucine

L-isoleucine is the L-enantiomer of isoleucine. 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, an aspartate family amino acid, an isoleucine and a proteinogenic amino acid. It is a conjugate base of a L-isoleucinium. It is a conjugate acid of a L-isoleucinate. It is an enantiomer of a D-isoleucine. It is a tautomer of a L-isoleucine zwitterion. — ChEBI

IUPAC name: (2S,3S)-2-amino-3-methylpentanoic acid

Molecular formula: C6H13NO2
Molecular weight: 131.17 g/mol
Exact mass: 131.094628657 Da
XLogP3: -1.7
Topological polar surface area: 63.3 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 2

Also known as

Isoleucine2S,3S-Isoleucine(S)-Isoleucine(S,S)-Isoleucine2-Amino-3-methylvaleric aciderythro-L-IsoleucineL-IleIsoleucina

16 more reported names

alpha-Amino-beta-methylvaleric acidNorvaline, 3-methyl-Valeric acid, 2-amino-3-methyl-Isoleucinumiso-leucine(2S,3S)-alpha-Amino-beta-methyl-n-valeric acid(2S,3S)-alpha-Amino-beta-merthylvaleric acid(S-(R*,R*))-2-Amino-3-methylpentanoic acid(2S,3S)-alpha-Amino-beta-merthyl-n-valeric acidNSC-46708FEMA NO. 467504Y7590D77CHEBI:17191[S-(R*,R*)]-2-Amino-3-methylpentanoic acid(2S,3S)-2-amino-3-methylpentanoateL-Isomer Isoleucine

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External database identifiers

ChEBI:CHEBI:17191
ChEMBL:CHEMBL1233584
EPA DTXSID:DTXSID1047441
EPA DTXSID:DTXSID2046882
PubMed:40885242
PubMed:39172838
PubMed:31926187
PubMed:29968805
PubMed:23108620
PubMed:23107499
PubMed:23105881
PubMed:23088461
PubMed:23084640
PubMed:23079773
PubMed:23061283
PubMed:23056478

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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