Science
Mechanism of Action
As a cationic, water-soluble copolymer, this ingredient functions by neutralizing negative charges on the skin's surface, forming a continuous, non-occlusive film. This film is understood to improve the skin's 'slip,' 'laydown,' and after-feel, leading to enhanced perceived smoothness without a heavy sensation. Furthermore, it acts as a humectant, allowing water molecules to attach to its film, which helps to retain moisture, protect the skin from dehydration, and shield against irritating molecules.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The ingredient's inherent cationic charge remains stable irrespective of pH. However, at significantly high pH values, the presence of hydroxyl groups may lead to a reduction in its water solubility.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has consistently reaffirmed Polyquaternium-11 as safe for cosmetic use, most recently in 2023, at concentrations up to 50%. It is considered mild, non-irritant, and non-sensitizing, with a low incidence of irritation/sensitization observed in typical cosmetic concentrations. Clinical photoreactivity studies showed no evidence of phototoxicity or photoallergenicity. While trace amounts of unreacted vinylpyrrolidone monomer may be present, these are at biologically insignificant levels. All efficacy and safety data provided in this profile specifically pertain to Polyquaternium-11.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyquaternium-11 is a valuable film-former and moisture-retainer, supporting improved skin texture and protection, underpinned by a robust safety profile and broad skin compatibility, though specific efficacy studies were not provided in the current data.
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References
Sources