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Official EU label nameGlossary entry 25117

S-ALLYLCYSTEINE

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.

0 markets with evidence
Markets checked
13
Markets with evidence
0
Evidence gaps
13
Resolved identifiers
1

Resolved substance identity

CAS:21593-77-1
Ingredient index records:
S-ALLYLCYSTEINE
Cosmetic functions: BLEACHING

L-Cysteine, S-2-propen-1-yl-

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1 matched or reported name
S-ALLYLCYSTEINE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name S-ALLYLCYSTEINE.

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 21593-77-1
CAS 21593-77-1PubChem CID 9793905

(+)-S-Allylcysteine

S-allylcysteine is an S-hydrocarbyl-L-cysteine that is L-cysteine in which the hydrogen attached to the sulphur is replaced by a prop-2-enyl group. It commonly occurs in garlic and has been found to exhibit antineoplastic activity. It has a role as a metabolite and an antineoplastic agent. It is a tautomer of a S-allylcysteine zwitterion. — ChEBI

IUPAC name
(2R)-2-amino-3-prop-2-enylsulfanylpropanoic acid
Molecular formula
C6H11NO2S
Molecular weight
161.22 g/mol
Exact mass
161.05104977 Da
XLogP3
-2.1
Topological polar surface area
88.6 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
1

Also known as

S-allyl-L-cysteineS-AllylcysteineS-Allyl cysteineL-Cysteine, S-2-propenyl-CHEBI:7407781R3X99M15FEMA NO. 4322NSC-96449
16 more reported names
(2R)-2-AMINO-3-(PROP-2-EN-1-YLSULFANYL) PROPANOIC ACIDRefChem:48874(2R)-2-azaniumyl-3-prop-2-enylsulfanylpropanoate2-amino-3-(prop-2-en-1-ylsulfanyl)propanoic acid(R)-3-(Allylthio)-2-aminopropanoic acidL-DEOXYALLIINDEOXYALLIINallyl-cysteineS-prop-2-en-1-yl-L-cysteineS-2-propenyl-L-cysteineL-Cysteine, S-2-propen-1-yl3-(ALLYLTHIO)-L-ALANINES-(2-PROPENYL)-L-CYSTEINEH-Cys(Allyl)-OHS-allyl-laevo-cystein(s)-allyl-l-cysteine
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

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 assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortalUS 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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