Other
2-ISOPENTENAL
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
2-isopentenal is a cosmetic ingredient used in product formulations. Exercise caution due to limited available safety data.
2-Isopentenal (also called 3-methyl-2-butenal or prenal) is an alpha,beta-unsaturated aldehyde with a powerful, sharp fruity-green scent used as a fragrance ingredient in perfumery. Alpha,beta-unsaturated aldehydes are inherently more reactive and potentially more problematic than saturated aldehydes. The source data shows no GHS hazard statements, but unsaturation confers a structural alert for sensitisation and irritation. IFRA guidelines restrict its use concentration. It is not listed in EU Annex restriction lists, but its reactivity profile warrants careful formulation control.
Known concerns
- Alpha,beta-unsaturated aldehyde structural alert — potential irritant and sensitiser
- Irritation potential at high concentrations in formulations
- IFRA restriction applies to maximum use level
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related others
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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.