Science
Mechanism of Action
As a cationic polymer, Polyquaternium-18 is electrostatically attracted to and binds with anionic sites on the skin's surface. This interaction facilitates the formation of a resilient, protective film. This film acts as a physical barrier, which can significantly minimize water evaporation from the skin and shield it from external irritants. Additionally, certain polyquaternium derivatives possess humectant properties, enabling them to attract and retain environmental moisture, thereby contributing to improved skin hydration and maintaining suppleness.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyquaternium compounds generally contribute to the stability of emulsion-based formulations by interacting with both oil and water phases, thereby preventing phase separation and enhancing overall product texture, feel, and spreadability. Related ingredients, such as Quaternium-18 Hectorite and Bentonite, are documented to exhibit stability across a range of pH conditions and normal cosmetic heat exposure.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not specifically reviewed Polyquaternium-18. While a related ingredient, 'Quaternium-18', has been deemed safe by the CIR for cosmetic use within current practices and concentrations, this assessment does not directly extend to Polyquaternium-18. No specific safety status from the SCCS or FDA was identified for this distinct ingredient.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyquaternium-18 demonstrates a clear film-forming mechanism, but its specific safety and efficacy for skincare applications lack direct clinical studies and regulatory review, warranting further investigation.
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References
Sources