Science
Mechanism of Action
As an ethoxylated fatty alcohol, Ceteth-16 reduces interfacial tension between oil and water phases, facilitating the formation of stable microscopic droplets. In cleansing applications, its amphiphilic structure captures lipophilic impurities, while its role as a penetration enhancer temporarily modifies the lipid bilayer of the stratum corneum to improve the bioavailability of co-formulated actives.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 The CIR Expert Panel confirmed safety for leave-on and rinse-off applications at concentrations up to 10%, provided the final formulation is tested for non-irritancy.
- 02 Safety analogues (Ceteth-2) indicate that while 2.5% may irritate compromised or abraded skin, concentrations up to 3% remain non-irritating on healthy, intact skin.
Transparency
Dusting Analysis
As a functional excipient rather than a primary active, Ceteth-16 is rarely 'dusted' for marketing claims. However, using it below 1% may indicate it is being used solely as a solubilizer for fragrances rather than a primary emulsifier or penetration enhancer.
The Formula
Formulation
Stability
Demonstrates excellent stability across a wide pH range (4.0–11.0); however, it is susceptible to oxidative degradation if exposed to prolonged high heat or UV light.
Synergies
- Active molecules requiring enhanced stratum corneum penetration
- Non-ionic co-emulsifiers
Conflicts
- Strong oxidizing agents
- Highly acidic or basic environments (hydrolysis risk)
- Cationic surfactants
Safety
Safety Profile
Ethoxylation process can produce 1,4-dioxane; Moumoujus standards require purification levels below 10 ppm to ensure consumer safety.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A reliable functional emulsifier and penetration enhancer that is best suited for non-acne-prone skin types due to its high comedogenicity rating.
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References
Sources