Science
Mechanism of Action
This ingredient functions as a surfactant by significantly lowering the surface tension at the water-oil interface, which enables the efficient removal of dirt, excess sebum, and other impurities from the skin. It also acts as an emulsifier, promoting the uniform blending of otherwise immiscible ingredients, and contributes to rich lather formation. While beneficial for controlling oil production and offering mild exfoliation, extended exposure, particularly at elevated concentrations, carries a risk of disrupting the skin's natural lipid barrier.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Clinical patch tests and comparative studies involving Sodium Laureth Sulfate have consistently shown that it can induce mild to strong skin irritation, with the severity directly correlating with concentration (e.g., within the 0.5% to 2.0% range). However, these studies confirm that it is not a skin sensitizer, meaning it does not typically cause allergic reactions.
Transparency
Dusting Analysis
Despite its noted potential for irritation in isolated studies (concentrations between 0.5% and 2.0%), Sodium Laureth-7 Sulfate is not commonly 'dusted' or broadly avoided within the skincare industry. Its 'safe as used' designation by regulatory bodies such as the CIR Expert Panel is contingent on precise formulation, where co-ingredients and concentration management mitigate its irritant potential, making it a manageable rather than an inherently problematic ingredient.
The Formula
Formulation
Stability
This ingredient exhibits robust stability across typical cosmetic pH ranges, in the presence of common metal ions, and against oxidizing agents. Optimal storage conditions require temperatures between 15°C and 25°C, away from direct sunlight and moisture. Preventing both overheating and freezing is crucial for maintaining its integrity.
Conflicts
- cationic surfactants
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that Sodium Laureth Sulfate and related compounds are safe when incorporated into cosmetic products under conditions of proper use. While acknowledged for its potential to cause eye and skin irritation, with intensity increasing with concentration, this risk is effectively managed through careful formulation. The FDA also permits its use, provided that levels of 1,4-dioxane, a potential impurity, are minimized.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Sodium Laureth-7 Sulfate is a highly effective cleansing and foaming agent, offering significant functional benefits when meticulously formulated to mitigate its moderate irritancy potential, aligning with precision skincare principles.
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