Official EU label nameGlossary entry 28766

THIOLACTIC ACID

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

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Markets with evidence

Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:79-42-5

EC:201-206-5

Ingredient index records:

THIOLACTIC ACID

Cosmetic functions: ANTIOXIDANT, DEPILATORY, FRAGRANCE, HAIR WAVING OR STRAIGHTENING, REDUCING

2-Mercaptopropionic acid

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1 matched or reported name

THIOLACTIC ACID

Regulatory evidence across markets

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

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 79-42-5

CAS 79-42-5PubChem CID 62326

(+-)-2-Mercaptopropionic acid

2-mercaptopropanoic acid is a mercaptopropanoic acid. — ChEBI

IUPAC name: 2-sulfanylpropanoic acid

Molecular formula: C3H6O2S
Molecular weight: 106.15 g/mol
Exact mass: 106.00885060 Da
XLogP3: 0.5
Topological polar surface area: 38.3 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 0

Also known as

2-Mercaptopropionic acidThiolactic acid2-Mercaptopropanoic acid2-Thiolactic acidalpha-Mercaptopropionic acidPROPANOIC ACID, 2-MERCAPTO-Propionic acid, 2-mercapto-O5U6967KGF

16 more reported names

CHEBI:47872RefChem:897821201-206-52-Thiolpropionic acidalpha-Mercaptopropanoic acidTiopronin Impurity B2-mercapto-propionic acidFEMA No. 3180Tiopronin Impurity 4EINECS 201-206-52-mercapto propionic acidUN2936BRN 0506218UNII-O5U6967KGFThiolactic acid [UN2936] [Poison]mercapto-propionic acid

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External database identifiers

ChEBI:CHEBI:47872
ChEMBL:CHEMBL2158192
EPA DTXSID:DTXSID80861636
PubMed:22881121
PubMed:22590376
PubMed:22158599
PubMed:21754186
PubMed:21754043
PubMed:21580700
PubMed:21522985
PubMed:21341648
PubMed:21212487
PubMed:21182324
PubMed:20857291
PubMed:20625484

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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