2-UNDECENAL
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
2-UNDECENAL is a cosmetic ingredient used in product formulation. Exercise caution due to limited available safety data.
2-Undecenal is an unsaturated aliphatic aldehyde functioning as a fragrance ingredient with a distinctive citrus, tangerine, and green odor profile. It is not listed in EU Annexes II or III, but unsaturated aldehydes present challenges for cosmetic formulators due to their reactivity. The double bond creates potential for oxidation and polymerization, and like many unsaturated carbonyl compounds, it may present mild skin sensitization concerns. The IFRA has evaluated similar unsaturated aldehydes and set restrictions where needed. At typical fragrance use levels, the risk is considered manageable in well-formulated products.
Skin benefits
- Provides fresh citrus-green fragrance character
- Natural component of some essential oils
Known concerns
- Unsaturation makes compound prone to oxidation and degradation
- Mild skin sensitization potential from aldehyde reactivity
- Requires antioxidant preservation in formulations
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.