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Fragrance

3-ETHYL-2-METHYLNON-2-ENOIC ACID

CAS 71850-80-1
55

Safety score · 0–100

Moderate

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

A branched unsaturated fatty-acid fragrance ingredient with a sharp odour profile. Sensitiser potential at higher concentrations means it is dosed low and IFRA-restricted in many product types.

Function

PERFUMING

Skin benefits

  • Aldehyde-class fragrance note

Known concerns

  • IFRA/RIFM-listed fragrance allergen
  • Skin sensitiser at higher use levels
  • Strong odour requires careful dosing

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, so always read the physical product label and consult a healthcare professional for personal concerns.