Laureth-23 is a high-performance non-ionic surfactant and emulsifier that stabilizes oil-in-water formulations. Its primary role involves solubilizing lipophilic ingredients into aqueous bases to ensure a uniform, aesthetically pleasing texture.
- INCI Name:
- Laureth-23
- Chemical/Scientific Name:
- Polyoxyethylene (23) Lauryl Ether
- Common Aliases:
- Polyethylene Glycol Monododecyl Ether, PEG-23 Lauryl Ether
| Category: | Emulsifiers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 2-3 |
| Primary Industries: | Skincare, Haircare, Personal Cleansing |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Formula Stability | |
| Texture Enhancement | |
| Cleansing Power | |
| Irritation Risk |
Primary Benefits:
- Ensures stable oil-in-water (O/W) emulsions by preventing phase separation.
- Functions as an effective solubilizer for fragrances and essential oils in Aqua bases.
- Provides wetting properties that allow products to spread evenly across the skin or hair.
- Maintains formula clarity in surfactant-based systems like gels and shampoos.
Potential Risks:
- May cause mild irritation in individuals with highly compromised skin barriers if used at high concentrations.
- Ethoxylation process involves 1,4-dioxane, though cosmetic-grade versions are strictly purified to remove trace impurities.
Biological Action & Cosmetic Profile
Functioning as a high Hydrophile-Lipophile Balance (HLB) agent, this ingredient possesses an HLB value of approximately 16.9. Such a high value indicates a strong affinity for water, making it exceptionally proficient at creating oil-in-water emulsions. It works by reducing the interfacial tension between oil and water phases, allowing microscopic oil droplets to remain suspended within the aqueous medium without coalescing. This mechanism is vital for maintaining the structural integrity of lotions and creams over their shelf life.
The molecular architecture consists of a hydrophobic tail derived from Lauric Acid and a hydrophilic polyoxyethylene chain. Because it is a non-ionic surfactant, it does not carry an electrical charge in solution. This lack of charge makes it highly compatible with a wide range of other cosmetic ingredients, including cationic hair conditioning agents and anionic cleansers. Unlike ionic surfactants, it is less likely to disrupt the skin’s protein structures, leading to a generally favorable safety profile in dermatological applications.
Surface-active properties also extend to its role as a wetting agent. By lowering the surface tension of the cosmetic vehicle, it allows the product to achieve better contact with the skin surface. This improved contact facilitates the uniform delivery of active substances and contributes to the “glide” felt during application. In haircare, it assists in the removal of sebum and environmental debris by emulsifying oils so they can be rinsed away with water.
Broader Applications & Origins
Synthetic manufacturing involves the ethoxylation of dodecyl alcohol (lauryl alcohol). The number “23” in its name signifies the average number of ethylene oxide units added to the fatty alcohol chain. While the starting fatty alcohol can be derived from coconut or palm oil, the final ingredient is categorized as synthetic due to the chemical processing required to attach the polyoxyethylene chains. Beyond skincare, this material is frequently utilized in permanent hair dyes and shaving preparations due to its excellent foam stabilization and emulsification capabilities.
Routine Integration
Synergies:
- Works optimally with low-HLB co-emulsifiers like Cetearyl Alcohol to create robust cream lattices.
- Enhances the stability of formulas containing humectants like Glycerin and Sodium Hyaluronate.
- Pairs well with preservatives like Phenoxyethanol without compromising antimicrobial efficacy.
Conflicts:
- No known significant ingredient conflicts; however, excessive use in leave-on products for extremely dry skin may theoretically contribute to some lipid leaching if the formula is not properly balanced with occlusives.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the Laureth group and concluded that these ingredients are safe for use in cosmetics when formulated to be non-irritating. Extensive toxicological data indicates that Laureth-23 is neither a potent sensitizer nor a photosensitizer. Regulatory bodies like the SCCS emphasize the importance of controlling impurities such as unreacted ethylene oxide and 1,4-dioxane during production. In clinical patch testing, Laureth-23 consistently demonstrates lower irritation potential compared to shorter-chain ethoxylated alcohols like Laureth-4.
Is Laureth-23 safe for acne-prone skin?
While it has a moderate comedogenic rating in its pure form, its concentration in finished products is typically very low (often under 5%). At these levels, it is unlikely to cause breakouts for most users, though those with highly reactive skin should patch-test new formulas.
Why is Laureth-23 used in “oil-free” products?
It is often used as a solubilizer for fragrance or oil-soluble vitamins. Because it allows these small amounts of oil to be completely dissolved in water, the resulting product can maintain a “water-like” or “oil-free” texture and appearance.
Is this ingredient “clean” or “natural”?
This is a synthetic ingredient. While the fatty alcohol base may be plant-derived, the ethoxylation process is a chemical synthesis. It is generally accepted in conventional “clean” beauty standards but is excluded from strict organic certifications like COSMOS or Ecocert.