Science
Mechanism of Action
Polyquaternium-115, a cationic polymer, creates a continuous, non-tacky film on the skin's surface. Its positive charge facilitates ionic bonding with the negatively charged skin, forming a protective barrier that reduces transepidermal water loss. This action improves skin hydration, softness, and smoothness. Additionally, it acts as a humectant, actively attracting and binding moisture to the skin.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Studies on product formulations containing Polyquaternium-115 demonstrated no irritation at 2.0%, while another formulation at 0.3% produced up to mild irritation, indicating potential formulation-specific responses.
- 02 Raw Polyquaternium-115 at concentrations up to 50% showed no skin sensitization and only isolated, transient irritation in repeated insult patch tests, underscoring its mild profile.
- 03 Clinical photoreactivity studies confirmed Polyquaternium-115 to be non-phototoxic and non-photoallergenic.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Polyquaternium-115 maintains optimal stability within a pH range of 5.0-7.0, as observed in a 10% solution.
Safety
Safety Profile
The CIR Expert Panel has consistently affirmed Polyquaternium-115 as safe for cosmetic use, with the most recent reaffirmation in 2023. Raw ingredient concentrations up to 50% in water have shown minimal to no signs of skin or eye irritation. It is broadly recognized as mild, non-irritant, and non-sensitizing to the skin. The FDA has reported its use at concentrations up to 50% across various hair care preparations.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyquaternium-115 is a valuable, low-irritancy ingredient, enhancing skin hydration and barrier function through its film-forming and humectant properties, making it suitable for normal, dry, and sensitive skin types.
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References
Sources