4-METHYLPENT-3-EN-2-ONE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
4-METHYLPENT-3-EN-2-ONE is a cosmetic ingredient used in product formulation. Exercise caution due to limited available safety data.
4-Methylpent-3-en-2-one (Mesityl oxide) carries no formally classified CLP hazards under current regulations but has been flagged for concern in some regulatory reviews due to its reactivity and potential oxidation products. It is not listed in EU Annexes II, III, or IV. Mesityl oxide is primarily used as a solvent in certain industrial applications and as a fragrance material. The alpha-beta unsaturated ketone structure suggests potential for skin sensitization with oxidation products. Occupational exposure limits exist.
Known concerns
- Potential for skin sensitization from oxidation products
- Limited cosmetic-specific safety data
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.