Compoatlas

ETHYL THIOGLYCOLATE

Official label name (INCI name, EU glossary of cosmetic ingredient names), No 10127

ETHYL THIOGLYCOLATE: Cited as an example in a rule, no rule of its own (Annex III, entry 2b), under Regulation (EC) No 1223/2009.

In plain words

What it is used for

Functions declared by manufacturers:

Depilatory: removes unwanted body hair.

Hair waving or straightening: modifies the chemical structure of the hair, allowing it to be set in the style required.

Reducing: changes the chemical nature of another substance by adding hydrogen or removing oxygen.

What the rules say

This name is only cited as an example in an entry of Annex III, which covers a family of substances: the exact conditions depend on the form used.

The text of the annexes

Allowed with restrictions

CosIng cites the name ETHYL THIOGLYCOLATE in this entry, whose regulated name is “Thioglycolic acid esters”: the title below says which form or use it covers.

Product type
Hair waving or straightening products
Maximum concentration
(a) 8% (b) 11% The abovementioned percentages are calculated as thioglycollic acid
Other conditions
(a) General use ready for use pH 6 to 9.5 (b) Professional use ready for use pH 6 to 9.5
Warning to print
Conditions of use: (a) (b) May cause sensitization in the event of skin contact Avoid contact with eyes In the event of contact with eyes, rinse immediately with plenty of water and seek medical advice Wear suitable gloves Warnings: Contains thioglycolate Follow the instructions Keep out of reach of children (b) For professional use only
Entry
Annex III, No 2b
Substance
Thioglycolic acid esters
Dates in the act (10)
  • Entry into force on 11 January 2010
  • Application from 1 December 2010
    It shall apply from 11 July 2013, with the exception of: — Article 15(1) and (2) which shall apply from 1 December 2010, as well as Articles 14, 31 and 32 to the extent that they are necessary to apply Article 15(1) and (2); and — Article 16(3) second subparagraph, which shall apply from 11 January 2013.
  • Entry into force on 1 December 2010
  • Condition applicable from 11 January 2012
    As from 11 January 2012, by way of derogation from Directive 76/768/EEC, notification carried out in accordance with Article 13 of this Regulation shall be considered to comply with Article 7(3) and Article 7a(4) of that Directive
  • Application from 11 January 2013
    July 2013, with the exception of: — Article 15(1) and (2) which shall apply from 1 December 2010, as well as Articles 14, 31 and 32 to the extent that they are necessary to apply Article 15(1) and (2); and — Article 16(3) second subparagraph, which shall apply from 11 January 2013.
  • Entry into force on 11 January 2013
  • Application from 11 July 2013
    It shall apply from 11 July 2013, with the exception of: — Article 15(1) and (2) which shall apply from 1 December 2010, as well as Articles 14, 31 and 32 to the extent that they are necessary to apply Article 15(1) and (2); and — Article 16(3) second subparagraph, which shall appl
  • Entry into force on 11 July 2013
  • Placing on the market before 11 July 2013
    Article 39 Transitional provisions By way of derogation from Directive 76/768/EEC, cosmetic products which comply with this Regulation may be placed on the market before 11 July 2013.
  • Placing on the market from 11 July 2013
    As from 11 July 2013, a distributor who makes available in a Member State a cosmetic product already placed on the market in another Member State and translates, on his own initiative, any element of the labelling of that product in order to comply with national law, shall submit, by electronic means, the following info

Excerpts from the English text published in the Official Journal. A date may concern only some substances of the act: the excerpt says so.

Identity

CosIng identifier
33850
CAS (according to CosIng)
623-51-8
EC (according to CosIng)
210-800-3
Declared functions
Depilatory, Hair waving or straightening, Reducing
Wikidata
Q27295042
PubChem
12185
ECHA InfoCard
100.009.819
InChIKey
PVBRSNZAOAJRKO-UHFFFAOYSA-N

Elsewhere in the world

Information on other jurisdictions. What is covered, and what is not yet.

United Kingdom (Great Britain)

  • Cited as an example in a rule, no rule of its own (Annex III)

Same entries as in the European Union. Conditions (concentrations, warnings) may differ: they are not compared here.

Switzerland

Regulation (EC) No 1223/2009 applies in Switzerland (Article 54 of the Ordinance on Foodstuffs and Utility Articles).

United States, federal rules

None of the integrated sections of the federal code (21 CFR 700.11 to 700.27 and 250.250) targets this name. The FDA does not publish a list of allowed ingredients.

Glossary: Commission Implementing Decision (EU) 2025/1175. Page updated on 21 October 2026.