Butyrolactonethiol
A cosmetic ingredient used as hair waving or straightening, reducing in skincare, haircare, and personal-care products sold in the European Union.
What is it?
2(3H)-Furanone, Dihydro-3-Mercapto-; Butyric acid, 4-hydroxy-2-mercapto-, gamma-lactone
What does it do?
Butyrolactonethiol is listed in the EU cosmetic ingredient inventory with the following declared functions:
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Hair waving or straightening
permanently changes the shape of hair through chemical reduction and re-oxidation of the hair's disulfide bonds
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Reducing
a reducing agent — donates electrons to break chemical bonds, used in perms and depilatories
EU regulatory status
Butyrolactonethiol is allowed for use in cosmetic products in the European Union under Regulation 1223/2009. It is not subject to a specific Annex restriction at the time of writing.
Frequently asked questions
What is Butyrolactonethiol?
Butyrolactonethiol is a cosmetic ingredient catalogued in the EU CosIng database. 2(3H)-Furanone, Dihydro-3-Mercapto-; Butyric acid, 4-hydroxy-2-mercapto-, gamma-lactone
Is Butyrolactonethiol allowed in cosmetics in the EU?
Yes. Butyrolactonethiol is allowed for use in cosmetic products in the EU under Regulation 1223/2009.
What does Butyrolactonethiol do in cosmetic products?
Butyrolactonethiol is declared in the EU cosmetic ingredient inventory with these functions: hair waving or straightening, reducing.
What is the CAS number of Butyrolactonethiol?
The CAS (Chemical Abstracts Service) number for Butyrolactonethiol is 14032-62-3.
Related ingredients
Source: EU CosIng database (European Commission). This page is derived from public-sector information published by the European Commission. · Last updated: 15/10/2010