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Preservative

SODIUM HYDROXYMETHANE SULFONATE

CAS 870-72-4 Updated
38

Safety score · 0–100

Caution

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

About

A formaldehyde-releasing reducing agent — slowly liberates formaldehyde, a Group 1 carcinogen, on skin. A known sensitizer for formaldehyde-allergic people and not recommended for leave-on cosmetic use.

Function

ANTIMICROBIALREDUCING

Skin benefits

  • Antimicrobial preservation in some industrial formulations
  • Reducing/bleaching agent in textiles

Known concerns

  • Formaldehyde donor — releases formaldehyde over time
  • IARC Group 1 carcinogen (formaldehyde) by class
  • Skin sensitizer in formaldehyde-allergic users
  • EU Annex V cosmetic preservative restrictions apply

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.