Science
Mechanism of Action
This ingredient operates solely as a fragrance component. It interacts with olfactory receptors to create a sensory experience, enhancing the perceived 'volume' and 'radiance' of fragrance compositions. Undecenal does not exhibit any identified direct mechanisms of action that confer specific benefits to the skin, such as hydration, anti-aging, or soothing properties.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
Undecenal is primarily a fragrance ingredient; therefore, the concept of 'dusting' related to active ingredient concentration for clinical efficacy is not applicable to its use.
The Formula
Formulation
Stability
Undecenal demonstrates robust stability across a broad pH spectrum in various formulation bases, including excellent performance in alcoholic solutions. Its optimal odor perception is noted at pH 6 (shampoo), pH 9 (fabric detergent), and pH 10 (soap), with good performance maintained across pH 3, 10.5, and 11. Due to its aldehyde functionality, it is susceptible to polymerization upon air exposure and can form adducts with amines. Stabilization, often with antioxidants like alpha-tocopherol, is essential, and storage should be in a tightly sealed, cool, dry container, protected from light, ideally under a nitrogen-purged headspace.
Conflicts
- Highly nucleophilic ingredients
- Amines (e.g., Indole, Anthranilates, Quinolines)
- Atmospheric oxygen (air)
Safety
Safety Profile
Undecenal is identified as a skin sensitizer and carries a risk of skin irritation and serious eye irritation. While some in vitro assays indicated potential cytotoxicity and genotoxicity, subsequent bacterial mutagenicity tests concluded it is not mutagenic and poses no genotoxic concern. The margin of exposure (MOE) is considered adequate for repeated dose toxicity within current usage parameters. The maximum acceptable concentration for topical application to the face/body is 0.78%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Undecenal is a potent fragrance component with no direct skincare benefits, presenting a high risk of skin sensitization and irritation, rendering its inclusion in precision skincare formulations questionable.
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References
Sources