Science
Mechanism of Action
Cinnamyl alcohol acts as a prohapten; while chemically stable in the bottle, it undergoes metabolic oxidation upon skin contact or autoxidation when exposed to air. This process converts the molecule into reactive haptens, such as cinnamaldehyde, which bind to epidermal proteins and can stimulate an immune-mediated allergic response.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Identified as weakly positive for sensitization in mouse Local Lymph Node Assays (LLNA) based on EC3 values.
- 02 Established as the No Expected Sensitization Induction Level (NESIL) for skin endpoints.
Transparency
Dusting Analysis
Because this ingredient is a known allergen, 'dusting' is not the primary concern; rather, any concentration exceeding 0.001% in leave-on products is a red flag for sensitive individuals and requires mandatory EU label disclosure.
The Formula
Formulation
Stability
Highly susceptible to rapid oxidation when exposed to heat, light, and oxygen, which significantly increases its potency as a skin sensitizer.
Conflicts
- Strong oxidizing agents
Safety
Safety Profile
Listed on the EU 26 fragrance allergen list. Usage is governed by IFRA standards which restrict concentrations to mitigate the risk of induction of skin sensitization.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A known allergen that offers no clinical skin benefits, posing a significant risk of sensitization for those with reactive skin.
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References
Sources