Science
Mechanism of Action
It functions by forming micelles, where its lipophilic tail binds to oils and debris, while the hydrophilic head allows rinsing. The larger molecular size due to ethoxylation minimizes skin penetration, contributing to its gentler action.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 In a 1983 clinical review, shampoos containing up to 31% Ammonium Laureth Sulfate showed extremely low consumer irritancy, with only 6 health complaints reported across 6.8 million units sold.
- 02 Clinical safety data suggests ethoxylated alkyl sulfates (like Laureth-9) are significantly less irritating than non-ethoxylated counterparts due to larger micelle size and reduced skin penetration.
Transparency
Dusting Analysis
As a primary surfactant, Ammonium Laureth-9 Sulfate is a functional ingredient used in effective concentrations for cleansing, not typically "dusted" at sub-efficacious levels.
The Formula
Formulation
Stability
Decomposes via hydrolysis at high temperatures (>40°C) or in highly acidic conditions (pH < 5), and is not suitable for highly alkaline systems.
Conflicts
- Cationic surfactants (forms insoluble complexes)
- Strongly alkaline ingredients
- Nitrosating agents (due to risk of nitrosamine formation)
Safety
Safety Profile
Safe for rinse-off products at typical concentrations (up to 30%); however, CIR advises <1% for leave-on applications to avoid irritation. Impurities like 1,4-dioxane must be limited to <1 ppm.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A valuable, mild cleansing and foaming agent, particularly suitable for rinse-off products due to its enhanced safety profile from ethoxylation.
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References
Sources