Skip to content

Active Ingredient

BUTYROLACTONETHIOL

CAS 14032-62-3 Updated
40

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A thiol-bearing butyrolactone used to reduce hair disulfide bonds during perms. Functions like thioglycolate but with a stronger odour and similar irritation potential; rinse-off use only.

Function

HAIR WAVING OR STRAIGHTENINGREDUCING

Skin benefits

  • Reducing agent for permanent hair waving
  • Disulfide-bond reshaping in hair
  • Alternative to ammonium thioglycolate

Known concerns

  • Strong sulfur odour and irritation potential
  • Skin and eye irritation with prolonged contact
  • Limited toxicological dataset versus mainstream thiols

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

Related active ingredients

40
Choline salicylate [USAN:INN:BAN:JAN]
Active Ingredient
 38
POTASSIUM MONOPERSULFATE
Active Ingredient
 38
RH-OLIGOPEPTIDE-2
Active Ingredient
 45
PIG UMBILICAL MESENCHYMAL STEM CELL EXOSOMES
Active Ingredient
 35
Sodium Fluorosilicate
Active Ingredient
 48
HYDNOCARPUS PENTANDRUS KERNEL OIL
Active Ingredient
 48
RICE RH-POLYPEPTIDE-45
Active Ingredient
 30
HUMAN EMBRYONIC KIDNEY CELL EXTRACELLULAR VESICLES
Active Ingredient

Check your shelf

Find BUTYROLACTONETHIOL in your products.

Scan any cosmetic product with LuxSense to see if it contains BUTYROLACTONETHIOL and get a full ingredient breakdown with safety scores.

This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.