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Hair Conditioning

Thioglycolic acid esters

Updated
30

Safety score · 0–100

Caution

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

About

Thioglycolate esters used in perms and depilatories. EU restricts these tightly because they irritate skin and eyes and can sensitize at salon-use concentrations.

Skin benefits

  • Effective hair-waving and depilatory action
  • Breaks disulfide bonds in keratin

Known concerns

  • EU Annex III restricted with strict concentration limits
  • Skin and eye irritant
  • Sensitizer in salon professionals
  • Strong odor and cytotoxic at higher %

References

EU

EU CosIng database

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

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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.