Fragrance avoidance
No fragrance-linked caution surfaced in the current profile.
This ingredient does not currently read as a fragrance-linked driver in the published evidence and hazard profile.
- beauty
Thioglycolic acid esters
70/100 · High conf.
Concern score
70/100High concern based on regulatory listings.
High confidence
Thioglycolic acid esters in plain language
On cosmetic ingredient lists it appears as “Butyl thioglycolate”.
Also known as Butyl thioglycolate · Ethyl thioglycolate · Glyceryl thioglycolate · Isooctyl thioglycolate · Isopropyl thioglycolate · Methyl thioglycolate
We don't have a plain-language description for Thioglycolic acid esters yet.
- High concern: no hazard classifications on record. It is restricted in EU cosmetics.
Why it's flagged
Thioglycolic acid esters is restricted in cosmetic products under Annex III of the EU Cosmetics Regulation (EC) 1223/2009.
RestrictedEU EC — restricted
The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.
Regulation
Restrictions first, then routine listings from published regulatory sources.
- EU Annex III — restricted
- EU restricted in cosmetics
- View source →restricted
EUEC
Annex III of EU Cosmetics Regulation (EC) 1223/2009: substances which cosmetic products must not contain except subject to the restrictions laid down. Product types: 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 Conditions of use and warnings: 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
EUCosIngActiveCosmetics Regulation annex III / ref 2b.
- Cosmetics Regulation annex III / ref 2b.Source →
Expert safety opinions
No expert opinion on file for Thioglycolic acid esters. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.
SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.
Evidence & sources
No graded research studies for Thioglycolic acid esters yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Good fit