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4-ETHYLBENZALDEHYDE

CAS 4748-78-1
58

Safety score · 0–100

Moderate

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

An aromatic aldehyde with a sharp, green, floral scent used as a fragrance material, carrying EU allergen declaration requirements.

4-Ethylbenzaldehyde (para-ethylbenzaldehyde) is an aromatic aldehyde with a distinctive green, slightly sweet odor profile. Like other aromatic aldehydes, it is identified in EU Regulation 1223/2009 Annex III as a fragrance allergen requiring mandatory declaration on cosmetic product ingredient lists. It has a long history of use in fragrance compounds but may cause sensitization reactions in susceptible individuals.

Skin benefits

  • Provides distinctive green, floral fragrance notes
  • Used in perfume and cosmetic fragrance compositions

Known concerns

  • EU declared fragrance allergen requiring label declaration
  • Skin sensitization possible in predisposed individuals
  • May cause eye irritation in cosmetic formulations

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.