Science
Mechanism of Action
As an amphiphilic molecule, Capryleth-4 works by lowering the surface tension of liquids, allowing water to mix with oil and debris. Its lipophilic C8 chain attaches to sebum and impurities, while its hydrophilic PEG-4 head remains attracted to water, effectively lifting and suspending contaminants so they can be easily rinsed away without disrupting the skin barrier.
Research
Clinical Evidence
High confidence2.5%
Key findings
- 01 Clinical human repeat insult patch tests (HRIPT) confirm that at concentrations between 0.5% and 5%, Capryleth-4 exhibits no significant sensitization or irritation potential.
- 02 Comparative safety assessments by the CIR indicate that while undiluted alkyl PEG ethers may cause mild irritation, they are benign when formulated within standard cosmetic usage ranges.
Transparency
Dusting Analysis
Because it is a functional emulsifier rather than an active 'hero' ingredient, it is rarely marketed with misleading claims. However, if used below 0.1% in a cleanser, it is likely not contributing meaningfully to the formula's surfactant system.
The Formula
Formulation
Stability
Exhibits exceptional stability across a broad pH spectrum due to its non-ionic nature. It is highly resistant to hydrolysis and maintains performance in the presence of various electrolytes.
Synergies
- Anionic surfactants
- Cationic conditioning agents
- Glycerin
Conflicts
- Phenolic preservatives
- Strong oxidizing agents
Safety
Safety Profile
The CIR Expert Panel considers this ingredient safe when formulated to minimize irritation; it is typically used far below the 25% safety ceiling in precision skincare.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A reliable and gentle formulation workhorse that ensures product stability and effective cleansing without compromising the skin's moisture barrier.
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