Ammonium Thioglycolate
⚠ EU RestrictedIdentification
CAS Number 5421-46-5
EINECS / EC 226-540-9
CosIng Ref 31902
Chemical Name Ammoniummercaptoacetate,
Formula C2H7NO2S
Mol. Weight 109.15 g/mol
Function & Classification
Primary Function Keratolytic
Secondary Functions HAIR WAVING OR STRAIGHTENING; REDUCING
Origin Synthetic
EU Regulatory Status
Max Leave-on 8%
Max Rinse-off 11%
Restrictions Max 8% (general use, pH 7–9.5); Max 11% (professional use, pH 7–9.5); Max 5% (rinse-off hair, general).
Conditions of Use Hair waving/straightening: max 8% (pH 7-9.5). Depilatory: max 5% (pH 7-12.7). Professional only for higher concentrations.
Mandatory Warning For professional use only. Can cause allergic reactions. Contains thioglycolate.
Safety Profile
No toxicology data available yet for this ingredient.
Check SCCS opinions or CIR reports for published safety assessments.
NOAEL · Dermal Absorption % · Sensitization
Formulation Guidelines
Usage level, pH range, solubility and addition phase not yet available.
Usage Level % · Addition Phase · Solubility
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