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Hair Conditioning

THIOLACTIC ACID

CAS 79-42-5 Updated
18

Safety score · 0–100

Avoid

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

About

Thiolactic acid, a hair-perming reducing agent that's acutely toxic and corrosive in raw form. EU regulations strictly limit its use, and it has a sharp odor and burn risk.

Function

ANTIOXIDANTDEPILATORYHAIR WAVING OR STRAIGHTENINGFRAGRANCEREDUCING

Skin benefits

  • Used at very low levels in permanent waving
  • Reducing agent for hair
  • Effective at altering disulfide bonds

Known concerns

  • GHS H301/H311/H330 — toxic by all routes
  • Strongly corrosive in raw form
  • Severe skin and eye damage potential
  • Strict EU restrictions on cosmetic use

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.