Science
Mechanism of Action
This ingredient operates as a cationic polymer, forming ionic bonds with the inherently negatively charged surfaces of skin and hair. Upon application, it develops a continuous, adherent film, which serves to diminish static electricity and confer conditioning benefits. Additionally, Polyquaternium-90 possesses humectant capabilities, drawing ambient moisture to the skin and contributing to a protective epidermal barrier that minimizes transepidermal water loss.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
Information regarding 'dusting' properties for this ingredient is not available in the provided research data.
The Formula
Formulation
Stability
Optimal pH range and specific stability characteristics are not detailed in the provided data.
Conflicts
- anionic surfactants
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has assessed Polyquaternium-90 as safe for cosmetic use, provided it adheres to specific concentration or use limitations. However, the CIR report explicitly notes that the 'weight of evidence' for skin, eye, and lung irritation is 'unknown/unassessed,' indicating significant data gaps. Safety assessments are often based on maximum reported 'as used' concentrations rather than comprehensive evaluation for this ingredient. No specific SCCS opinion or FDA approval status is available in the provided data.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While Polyquaternium-90 is assessed as 'safe with restrictions' by CIR and offers film-forming and humectant properties, the notable data gaps concerning skin irritation and the absence of specific clinical efficacy data for skin applications render its direct value in precision skincare questionable.
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References
Sources