Science
Mechanism of Action
Polyquaternium-45 functions as a cationic polymer, adhering to the negatively charged surfaces of the skin. This interaction facilitates the formation of a fine, invisible film that enhances skin smoothness and imparts a soft sensation. This polymeric film serves as a protective barrier, effectively minimizing transepidermal water loss (TEWL) and thereby contributing to sustained moisturization and hydration. Beyond its direct hydrating properties, it may also contribute to reinforcing the skin barrier and shielding other sensitive active ingredients from degradation.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
While no specific optimal pH range for Polyquaternium-45 has been established, other Polyquaterniums, such as Polyquaternium-10 (stable pH 4-8) and Polyquaternium-22 (stable pH 1-14), demonstrate broad pH stability, suggesting similar resilience for the class.
Conflicts
- Cationic polyquaterniums can complex with anionic surfactants, potentially leading to undesirable film formation or product instability in certain formulations.
- Excessive use of cationic formulations may result in product build-up.
Safety
Safety Profile
Polyquaternium-45 has not undergone a specific safety review by the Cosmetic Ingredient Review (CIR) Expert Panel, the Scientific Committee on Consumer Safety (SCCS), or received a specific status from the FDA. While other polyquaterniums have been evaluated (e.g., Polyquaternium-6, -22, -39), a definitive safety conclusion specific to Polyquaternium-45 is currently unavailable.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyquaternium-45 offers potential benefits for skin hydration and texture improvement through its film-forming action; however, its specific safety profile and clinical efficacy remain largely undefined.
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References
Sources