4-Phenylbut-3-en-2-one (Benzylideneacetone)
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
4-Phenylbut-3-en-2-one (Benzylideneacetone) is a cosmetic ingredient used in product formulation. Exercise caution due to limited available safety data.
Benzylideneacetone is an unsaturated ketone functioning as a fragrance and flavoring ingredient. It carries EU GHS hazard classifications H315 (causes skin irritation) and H317 (may cause allergic skin reaction). While it appears in the EU CosIng database, formulators must ensure adequate concentration limits are observed and appropriate allergen labeling is applied.
Skin benefits
- Provides warm, spicy fragrance notes in cosmetic formulations
Known concerns
- H317: May cause allergic skin reaction
- H315: Causes skin irritation
- Classified as a fragrance allergen requiring declaration
References
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.