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Preservative

FORMIC ACID

CAS 64-18-6
30

Safety score · 0–100

Caution

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

A simple organic acid sometimes used as a preservative or pH adjuster. Strongly corrosive in concentrated form; EU caps cosmetic use at 0.5%. Best avoided in leave-on products.

Function

FRAGRANCEPRESERVATIVEpH ADJUSTERS

Skin benefits

  • Acidifier and pH adjuster
  • Mild antimicrobial activity
  • Preservative booster

Known concerns

  • Corrosive to skin and eyes (GHS H314)
  • Toxic if inhaled (H331)
  • EU restricts to 0.5% in cosmetics
  • Irritant even at low levels

References

EU

EU CosIng database

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

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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Formic acid and its sodium salt
Preservative

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