Skip to main content
CosIng Checker
CosIng Checker
EU cosmetic ingredients, restrictions and safety
Login
InventoryRef 3506623/05/2019

LYSINE CARBOXYMETHYL CYSTEINATE

DL-Lysine, compound with S-(carboxymethyl)-L-cysteine (1:1)

LYSINE CARBOXYMETHYL CYSTEINATE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

INCI CheckerCompare all markets Search similar

Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

Markets and their official sourcesSearch every market for this name

Chemical identity and properties

PubChem 2D chemical structure for CAS 49673-81-6
CAS 49673-81-6PubChem CID 6452154

L-Lysine, compd. with S-(carboxymethyl)-L-cysteine (1:1)

IUPAC name
(2R)-2-amino-3-(carboxymethylsulfanyl)propanoic acid;(2S)-2,6-diaminohexanoic acid
Molecular formula
C11H23N3O6S
Molecular weight
325.38 g/mol
Exact mass
325.13075664 Da
Topological polar surface area
215.0 Ų
Hydrogen-bond donors
6
Hydrogen-bond acceptors
10
Covalent units
2
Defined stereocentres
2

Also known as

carbocysteine lysine1D1Y95PXXARefChem:1088215256-425-9L-Lysine S-(carboxymethyl)-L-cysteine(R)-2-Amino-3-((carboxymethyl)thio)propanoic acid compound with (S)-2,6-diaminohexanoic acid (1:1)UNII-1D1Y95PXXAEINECS 256-425-9
11 more reported names
L-Lysine, compound with S-(carboxymethyl)-L-cysteine (1:1)LYSINE CARBOXYMETHYL CYSTEINATECARBOCISTEINE LYSINELYSINE CARBOCYSTEINATE(2R)-2-amino-3-[(carboxymethyl)sulfanyl]propanoic acid; (2S)-2,6-diaminohexanoic acidS-Carboxymethyl-L-cysteine lysinateCARBOCISTEINE LYSINE [MART.]CARBOCISTEINE LYSINE [WHO-DD](R)-2-Amino-3-((carboxymethyl)thio)propanoic acid,(S)-2,6-diaminohexanoic acidS-(Carboxymethyl)cysteine--lysine (1/1)S-(Carboxymethyl)-L-cysteine--L-lysine (1/1)
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.

PubChem 2D chemical structure for CAS 79458-68-7
CAS 79458-68-7PubChem CID 157297

Einecs 279-164-2

IUPAC name
(2R)-2-amino-3-(carboxymethylsulfanyl)propanoic acid;2,6-diaminohexanoic acid
Molecular formula
C11H23N3O6S
Molecular weight
325.38 g/mol
Exact mass
325.13075664 Da
Topological polar surface area
215.0 Ų
Hydrogen-bond donors
6
Hydrogen-bond acceptors
10
Covalent units
2
Defined stereocentres
1

Also known as

DL-Lysine, compound with S-(carboxymethyl)-L-cysteine (1:1)
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.

Inventory details for LYSINE CARBOXYMETHYL CYSTEINATE

INCI name

LYSINE CARBOXYMETHYL CYSTEINATE

Description

DL-Lysine, compound with S-(carboxymethyl)-L-cysteine (1:1)

Record provenance

Inventory reference
35066
Imported identity
LYSINE CARBOXYMETHYL CYSTEINATE
Source update
23/05/2019
European Commission CosIng source notes
Browse

Browse EU annexes

Explore Annex II–VI to see which substances are prohibited, restricted or permitted under specific conditions.

Search

Search annex entries

Search the annex database for entries matching LYSINE CARBOXYMETHYL CYSTEINATE or related substances.

Key data

CAS
79458-68-7, 49673-81-6
EC
279-164-2, 256-425-9
Restriction
—
Function
HAIR WAVING OR STRAIGHTENING
Modifying the chemical structure of the hair, allowing it to be set in the style required (permanent waves or hair straightening).
SKIN CONDITIONING
Maintaining the skin in good condition.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#15679 · LYSINE CARBOXYMETHYL CYSTEINATE

Ingredients with overlapping formulation functions

ISOPROPYL THIOGLYCOLATEHAIR WAVING OR STRAIGHTENING
LINUM USITATISSIMUM SEED POLYSACCHARIDEHAIR FIXING, HAIR WAVING OR STRAIGHTENING
LITHIUM CARBONATEBUFFERING, HAIR WAVING OR STRAIGHTENING
LITHIUM HYDROXIDEBUFFERING, HAIR WAVING OR STRAIGHTENING
MAGNESIUM THIOGLYCOLATEDEPILATORY, HAIR WAVING OR STRAIGHTENING, REDUCING
MEA-THIOLACTATEHAIR WAVING OR STRAIGHTENING
MERCAPTOPROPIONIC ACIDDEPILATORY, HAIR WAVING OR STRAIGHTENING, REDUCING
METHACRYLOYL HYDROLYZED SOY PROTEINANTIOXIDANT, HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING, SKIN CONDITIONING, SKIN PROTECTING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How LYSINE CARBOXYMETHYL CYSTEINATE appears in the CosIng inventory

The CosIng inventory lists LYSINE CARBOXYMETHYL CYSTEINATE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

LYSINE CARBOXYMETHYL CYSTEINATE is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

LYSINE CARBOXYMETHYL CYSTEINATE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, LYSINE CARBOXYMETHYL CYSTEINATE carries the following function designation(s):

CAS 79458-68-7, 49673-81-6 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

Use the INCI Checker to screen a full ingredient list across selected markets, or compare this substance across all supported market datasets.
Open INCI Checker

Source note for LYSINE CARBOXYMETHYL CYSTEINATE

This page reproduces the CosIng inventory entry for LYSINE CARBOXYMETHYL CYSTEINATE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research LYSINE CARBOXYMETHYL CYSTEINATE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

View sourcesView updates

Tools & next steps

Check your formula

Scan a full INCI list to detect LYSINE CARBOXYMETHYL CYSTEINATE and any linked EU annex restrictions or allergen flags.

INCI Checker

Search similar ingredients

Find other inventory ingredients and annex entries related to LYSINE CARBOXYMETHYL CYSTEINATE, its identifiers or nearby name variants.

Search