What does the restriction note for MEA-THIOLACTATE mean?

The restriction field for MEA-THIOLACTATE reads: III/61. This is the restriction note from the CosIng inventory. For authoritative conditions and limits, always refer to the linked annex entries.

What other records share CAS 54266-38-5?

CAS 54266-38-5 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains MEA-THIOLACTATE?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 3519215/10/2010

MEA-THIOLACTATE

Propanoic acid, 2-mercapto-, compound with 2-aminoethanol (1:1)

MEA-THIOLACTATE is linked to 1 EU annex record on this page. Inventory note: III/61.

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Regulatory evidence by market

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Market	Evidence status	Records	Source language
European Union	Evidence linked Restricted entry found Open this evidence	1	English and EU languages
Great Britain	Source mapped Official source mapped; ingredient rule not imported	0	English
Canada	Source mapped Official source mapped; ingredient rule not imported	0	English and French
New Zealand	Source mapped Official source mapped; ingredient rule not imported	0	English
ASEAN	Source mapped Official source mapped; ingredient rule not imported	0	English and national languages
China	Source mapped Official source mapped; ingredient rule not imported	0	Chinese with selected English material
Japan	Source mapped Official source mapped; ingredient rule not imported	0	Japanese; official English translation available
South Korea	Source mapped Official source mapped; ingredient rule not imported	0	Korean with some English names
United States	Source mapped Official source mapped; ingredient rule not imported	0	English
Australia	Source mapped Official source mapped; ingredient rule not imported	0	English
Brazil	Source mapped Official source mapped; ingredient rule not imported	0	Portuguese with INCI crosswalks
India	Source mapped Official source mapped; ingredient rule not imported	0	English and Hindi
Saudi Arabia	Source mapped Official source mapped; ingredient rule not imported	0	Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 54266-38-5

CAS 54266-38-5PubChem CID 6452961

(2-Hydroxyethyl)ammonium 2-mercaptopropionate

IUPAC name: 2-hydroxyethylazanium;2-sulfanylpropanoate

Molecular formula: C5H13NO3S
Molecular weight: 167.23 g/mol
Exact mass: 167.06161445 Da
Topological polar surface area: 89.0 Å²
Hydrogen-bond donors: 3
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 0

Also known as

EINECS 259-050-9RefChem:395908259-050-9DB-344590

Open full PubChem record PubChem annotations 3D structure image

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 MEA-THIOLACTATE

INCI name

MEA-THIOLACTATE

Description

Propanoic acid, 2-mercapto-, compound with 2-aminoethanol (1:1)

Record provenance

Inventory reference: 35192
Imported identity: MEA-THIOLACTATE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for MEA-THIOLACTATE

Annex III Restriction reference

Entry 61

Monoalkylamines, monoalkanolamines and their salts

Key data

CAS

54266-38-5

259-050-9

Restriction

III/61

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).

Official EU ingredient-name evidence

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

#16093 · MEA-THIOLACTATE

Ingredients with overlapping formulation functions

LITHIUM CARBONATEBUFFERING, HAIR WAVING OR STRAIGHTENING

LITHIUM HYDROXIDEBUFFERING, HAIR WAVING OR STRAIGHTENING

LYSINE CARBOXYMETHYL CYSTEINATEHAIR WAVING OR STRAIGHTENING, SKIN CONDITIONING

MAGNESIUM THIOGLYCOLATEDEPILATORY, HAIR WAVING OR STRAIGHTENING, REDUCING

MERCAPTOPROPIONIC ACIDDEPILATORY, HAIR WAVING OR STRAIGHTENING, REDUCING

METHACRYLOYL HYDROLYZED SOY PROTEINANTIOXIDANT, HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING, SKIN CONDITIONING, SKIN PROTECTING

METHOXY PEG-450 AMIDOGLUTAROYL SUCCINIMIDECLEANSING, HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING

METHYL THIOGLYCOLATEHAIR WAVING OR STRAIGHTENING

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 chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox 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

How MEA-THIOLACTATE appears in the CosIng inventory

The CosIng inventory lists MEA-THIOLACTATE as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

MEA-THIOLACTATE is also tagged with 1 cosmetic function 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

MEA-THIOLACTATE appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for MEA-THIOLACTATE reads: "III/61". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

According to the EU CosIng inventory, MEA-THIOLACTATE carries the following function designation(s):

HAIR WAVING OR STRAIGHTENING

CAS 54266-38-5 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.

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Source note for MEA-THIOLACTATE

This page combines the CosIng inventory entry for MEA-THIOLACTATE with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

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

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Tools & next steps

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