Science
Mechanism of Action
By reducing interfacial tension, Ceteareth-15 facilitates the creation of stable oil-in-water (O/W) emulsions. Beyond its primary structural role, its ethoxylated nature allows it to act as a penetration enhancer, temporarily modifying the skin's lipid barrier to improve the delivery of neighboring active molecules.
Research
Clinical Evidence
High confidence1.5%
Key findings
- 01 Human Repeat-Insult Patch Tests (HRIPT) at 1.35% confirmed the ingredient as a non-sensitizer.
- 02 Patch testing over 4-day and 21-day periods at 1.5% concentration demonstrated minimal to zero irritation potential.
- 03 Dermal exposure trials at concentrations as high as 10% showed only minimal irritation in animal models.
Transparency
Dusting Analysis
As a functional emulsifier, Ceteareth-15 is rarely 'dusted' for marketing purposes. It is typically included at levels between 1% and 5% to achieve formula stability; concentrations below 0.5% may indicate a lack of significant structural contribution.
The Formula
Formulation
Stability
Possesses a broad chemical stability range (pH 3.0–12.0) and high electrolyte tolerance, though emulsion integrity is peak within physiological skin pH levels.
Synergies
- Lipophilic actives
- Electrolyte-rich botanical extracts
Conflicts
- Strong oxidizing agents
- Damaged or compromised skin barriers
Safety
Safety Profile
While safe for general use, it must not be applied to broken or severely damaged skin (such as burns) due to the risk of systemic absorption of PEG-based components. Purity standards require monitoring for 1,4-dioxane.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A reliable, non-irritating stabilizer that bridges the gap between texture and ingredient delivery in sophisticated emulsions.
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References
Sources