Science
Mechanism of Action
Operating as a cationic polymer, Polyquaternium-17's positive charges selectively bind to the skin's negatively charged sites. It functions as a humectant, actively attracting moisture to the skin, and concurrently forms a resilient film on the skin's surface. This film acts as a protective barrier, effectively minimizing transepidermal water loss and shielding against environmental irritants. Its unique deposition mechanism involves becoming less soluble upon dilution, allowing it to form a tenacious, rinse-resistant layer, which also contributes to improved product spreadability and overall skin texture.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
No specific optimal pH range has been identified for Polyquaternium-17. However, general polyquaterniums are known to contribute to the stabilization of emulsion-based formulations.
Safety
Safety Profile
While Polyquaternium-17 itself lacks a specific Cosmetic Ingredient Review (CIR) report, the CIR Expert Panel has evaluated similar polyquaterniums (e.g., Polyquaternium-6, -11, -22, -39), concluding their safety in cosmetics within specified concentrations. This assessment is partly based on their large, highly polar molecular structure, which renders significant skin absorption unlikely. The EWG Skin Deep database assigns Polyquaternium-17 a 'LOW' hazard score for categories including cancer, allergies & immunotoxicity, and developmental and reproductive toxicity. Its listing in Cosmile Europe further indicates its approved use within the EU market.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyquaternium-17 is a valuable conditioning and film-forming polymer that enhances skin hydration and barrier function, improving product aesthetics with a favorable safety profile.
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References
Sources