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Official EU label nameGlossary entry 7984

CYSTINE

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
2

Resolved substance identity

CAS:56-89-3
EC:200-296-3
Ingredient index records:
CYSTINE
Cosmetic functions: ANTISTATIC, FRAGRANCE, HAIR CONDITIONING

Cystine

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2 matched or reported names
CYSTINEcystine

Regulatory evidence across markets

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

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 56-89-3
CAS 56-89-3PubChem CID 67678

(-)-Cystine

L-cystine is the L-enantiomer of the sulfur-containing amino acid cystine. It has a role as an EC 1.2.1.11 (aspartate-semialdehyde dehydrogenase) inhibitor, a flour treatment agent, a mouse metabolite, a Saccharomyces cerevisiae metabolite and a human metabolite. It is a cystine, a non-proteinogenic L-alpha-amino acid and a L-cysteine derivative. It is a conjugate acid of a L-cystine anion. It is an enantiomer of a D-cystine. It is a tautomer of a L-cystine zwitterion. — ChEBI

IUPAC name
(2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid
Molecular formula
C6H12N2O4S2
Molecular weight
240.3 g/mol
Exact mass
240.02384922 Da
XLogP3
-6.3
Topological polar surface area
177.0 Ų
Hydrogen-bond donors
4
Hydrogen-bond acceptors
8
Covalent units
1
Defined stereocentres
2

Also known as

L-cystinecystineL-Dicysteinebeta,beta'-DithiodialanineL-Cysteine disulfide1-CystineCystine, L-Dicysteine
16 more reported names
Cystine (L)-Cystine acidCysteine disulfideCystinAlanine, 3,3'-dithiodi-Alanine, 3,3'-dithiobis-beta,beta'-Dithioalanine, L-L-Alanine, 3,3'-dithiobis-L-alpha-Diamino-beta-dithiolactic acid3,3'-Dithiobis(2-aminopropanoic acid)3,3'-DithiodialaninecistinaBis(beta-amino-beta-carboxyethyl)disulfide(R-(R*,R*))-3,3'-Dithiobis(2-aminopropanoic acid)48TCX9A1VTbeta,beta'-Diamino-beta,beta'-dicarboxydiethyl disulfide
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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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