Laureth-7 is a synthetic, non-ionic surfactant and emulsifier utilized to stabilize oil-in-water emulsions. It is frequently employed in lightweight gel-cream textures to ensure a smooth, cosmetically elegant application while maintaining formula homogeneity.
- INCI Name:
- Laureth-7
- Chemical/Scientific Name:
- Heptaethylene glycol monododecyl ether
- Common Aliases:
- Polyoxyethylene (7) Lauryl Ether, Polyethylene Glycol (7) Monolauryl Ether
| Category: | Emulsifiers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 1 |
| Primary Industries: | Skincare, Haircare, Personal Care |
| Solubility: | Water-soluble, Alcohol-soluble |
At a Glance: Properties & Effects
| Formula Stability | |
| Texture Enhancement | |
| Penetration Enhancement | |
| Irritation Risk |
- Primary Benefits:
- Ensures the stable suspension of oil droplets within a water-based medium.
- Improves the spreadability and tactile profile of skincare formulations.
- Acts as a mild wetting agent to facilitate more uniform coverage on the stratum corneum.
- Potential Risks:
- Potential for skin irritation in individuals with compromised barriers when used at very high concentrations.
- Concerns regarding trace amounts of 1,4-dioxane, though modern manufacturing purification processes mitigate this risk.
Biological Action & Cosmetic Profile
Functioning as a non-ionic surfactant, this ingredient lowers the surface tension between the aqueous and lipid phases of a product. The “7” in its name denotes the average number of moles of ethylene oxide reacted with lauryl alcohol during the ethoxylation process. With a Hydrophilic-Lipophilic Balance (HLB) value of approximately 12.1, it is optimized for creating oil-in-water (O/W) emulsions.The molecular structure consists of a hydrophobic tail (lauryl alcohol) and a hydrophilic head (polyethylene glycol chain). This amphiphilic nature allows it to sit at the interface of oil and water, preventing phase separation. Beyond basic emulsification, it is often a critical component of thickening blends alongside Polyacrylamide. In these systems, it helps the polymer network remain stable while delivering a characteristic “silkiness” upon skin contact.Surface-level absorption is minimal, as its primary role is functional within the vehicle itself rather than being a bioactive agent. However, as a surfactant, it may slightly modify the lipid bilayer of the skin, which can marginally increase the penetration of other active substances in the formula.
Broader Applications & Origins
Synthesis of this compound involves the ethoxylation of lauryl alcohol, typically derived from palm kernel or coconut oil, though the processing makes the final material purely synthetic. Its versatility extends beyond facial skincare into haircare, where it aids in the dispersion of conditioning agents, and cleansing products, where it serves as a secondary surfactant to improve foam quality.
Routine Integration
- Synergies:
- Polymer Thickeners: Works optimally with Polyacrylamide to create high-viscosity gel-creams without heaviness.
- Humectants: Stable in the presence of Glycerin and Sodium Hyaluronate.
- Silicones: Compatible with Dimethicone for enhancing the slip and occlusion of a formulation.
- Conflicts:
- No known chemical conflicts with common cosmetic actives.
Clinical Consensus & Safety
Dermatological assessments by the Cosmetic Ingredient Review (CIR) Expert Panel conclude that Laureth-7 is safe for use in cosmetic formulations. The panel noted that while ethoxylated alcohols can potentially be irritating, this effect is concentration-dependent and typically absent in finished skincare products which utilize it as a secondary emulsifier. Regulatory bodies like CosIng emphasize that manufacturers must ensure the absence of residual 1,4-dioxane, a byproduct of ethoxylation, through vacuum stripping or other purification techniques. It is not considered a sensitizer or a significant comedogen at standard industry usage levels.
Is Laureth-7 a “clean” ingredient?
While synthetic and ethoxylated, it is approved for use by major global regulatory bodies. Consumers following “clean” beauty standards may avoid it due to the ethoxylation process, though purified versions pose no health risk.
Does it cause acne or clogged pores?
This ingredient has a low comedogenicity rating of 1. It is generally considered safe for acne-prone skin, especially as it is usually present in low percentages within water-light formulations.
Why is it often grouped with polyacrylamide?
It is part of a widely used commercial thickening blend. In this trio, Aqua, Polyacrylamide, and Laureth-7 work together to create a stable, non-greasy cream texture that absorbs quickly.