Science
Mechanism of Action
The oil's primary bioactive, cinnamaldehyde, operates by disrupting the cell membranes and biofilm integrity of pathogenic bacteria like S. aureus. It modulates the skin's micro-environment by inhibiting inflammatory markers such as vascular cell adhesion molecules and macrophage colony-stimulating factors, while its astringent properties help normalize lipid distribution and physically tighten pore structure.
Research
Clinical Evidence
Medium confidence0.05%
Key findings
- 01 Demonstrated significant antibacterial activity against K. pneumonia when delivered via nanoemulsion.
- 02 Inhibited S. aureus growth by compromising bacterial cell wall integrity.
Transparency
Dusting Analysis
Because the maximum safe concentration for leave-on products is exceptionally low (0.05%), many brands include it purely for olfactory marketing ('dusting') at levels far below the 0.025% required for therapeutic antibacterial benefit.
The Formula
Formulation
Stability
Highly volatile and sensitive to oxidation. Cinnamaldehyde can convert to diethylacetals during stability testing; nanoemulsion technology using surfactants like polysorbate 80 is recommended to improve water dispersibility and ingredient longevity.
Synergies
- Polysorbate 80
- Carrier oils
- Nanoemulsion delivery systems
Conflicts
- Benzaldehyde
- Benzyl benzoate
- Aerosol delivery systems
- Undiluted application
Safety
Safety Profile
Classified by the SCCS as an established human contact allergen. Usage is restricted to 0.05% in topical applications to prevent severe irritation. Should be avoided by those on blood thinners due to coumarin content (max 0.1% of the oil).
Your Skin
Skin Compatibility
Our Assessment
Verdict
While it offers valid antimicrobial and pore-refining benefits, its extremely narrow safety margin and high risk of sensitization make it a high-risk inclusion for most skincare profiles.
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