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Preservative

Formic acid and its sodium salt

CAS 64-18-6 / 141-53-7 Updated
45

Safety score · 0–100

Moderate

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

About

The simplest carboxylic acid, used as a pH adjuster and preservative. Corrosive when concentrated; EU caps cosmetic use at 0.5% (as free acid) in Annex III.

Skin benefits

  • pH adjuster and preservative
  • Naturally occurring organic acid
  • Effective at low concentration

Known concerns

  • Corrosive in concentrated form (H314)
  • EU Annex III max 0.5% (as acid) in cosmetics
  • Do not use on broken skin

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.