Science
Mechanism of Action
As a surfactant, Sodium Laureth-5 Sulfate functions by significantly lowering the surface tension between different ingredients, facilitating their mixture and dispersion. Its molecular structure, featuring a larger water-soluble head group, contributes to its milder action compared to Sodium Lauryl Sulfate (SLS). It actively cleanses by attracting and encapsulating impurities, oils, and dirt, forming micelles that can be easily rinsed away. While effective in cleansing, surfactants like Sodium Laureth-5 Sulfate possess the capacity to disrupt the skin barrier by penetrating its uppermost layer. Related compounds such as SLS are known to interfere with skin barrier integrity through mechanisms including direct action on corneocytes leading to swelling, denaturation of keratin proteins, an increase in stratum corneum pH, and alterations in lipid synthesis.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
To preserve its integrity and optimize skin compatibility, Sodium Laureth-5 Sulfate, similar to related ingredients like SLES, is recommended to be formulated within a pH range of 5.0 to 7.0. This ingredient maintains its effectiveness across a broad pH spectrum, performing well in both acidic and alkaline conditions, as well as in hard water environments.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has identified strong evidence of human irritation for Sodium Laureth-5 Sulfate, indicating that its safe use is contingent upon adherence to specific concentration limits within finished products. Although it is generally considered milder and less irritating than Sodium Lauryl Sulfate (SLS), and related Sodium Laureth Sulfate (SLES) is deemed safe with concentration or use limitations (commonly used at 5-40%), a significant concern arises from the potential for 1,4-dioxane contamination during manufacturing. This impurity is a known carcinogen, and while the FDA encourages its removal, its complete elimination is not federally mandated.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While offering effective cleansing and foaming, Sodium Laureth-5 Sulfate presents a questionable choice for precision skincare due to strong evidence of human irritation, potential for skin barrier disruption, and concerns regarding 1,4-dioxane contamination, necessitating strict formulation controls and concentration limits.
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