Science
Mechanism of Action
Ceteareth-29 functions by lowering the interfacial tension between aqueous and lipid components. Its amphiphilic structure—comprising a lipophilic cetearyl chain and a hydrophilic polyoxyethylene chain—allows it to encapsulate oil droplets within a water base, creating stable oil-in-water (O/W) emulsions while also acting as a solubilizer for effectively dispersing lipophilic impurities during cleansing.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 Clinical 4-day and 21-day patch tests on representative Ceteareth members showed only minimal irritation at 1.5% concentration.
- 02 Human Repeat-Insult Patch Tests (HRIPT) at 1.35% concentration established the ingredient as non-sensitizing to human skin.
- 03 Dermal exposure studies at concentrations as high as 10.0% reported minimal irritancy potential within finished formulations.
Transparency
Dusting Analysis
As a functional emulsifier rather than a bio-active hero ingredient, Ceteareth-29 is rarely used for marketing claims; its inclusion is typically driven by the structural requirements of the formulation itself.
The Formula
Formulation
Stability
Exhibits exceptional thermal stability, making it ideal for hot-process emulsification. It acts as a protective colloid to prevent phase separation across a remarkably broad pH spectrum.
Synergies
- Cetearyl Alcohol
- Glycerin
- Mineral UV Filters
Conflicts
- Strong oxidizing agents
- Tannic acid
- Damaged or compromised skin barriers
Safety
Safety Profile
While safe for general cosmetic use, it should be excluded from products intended for damaged or broken skin to prevent potential PEG-related nephrotoxicity. Industry standards require strict limit controls on impurities like 1,4-dioxane.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An essential and highly stable emulsifying agent that provides the necessary structural integrity for sophisticated, multi-phase skincare delivery systems.
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References
Sources