Ammonium Laureth Sulfate
INCI: AMMONIUM LAURETH SULFATE
Reviewed by Emma · Last updated 14 Aug 2026
Also known as: Ammonium Laureth Sulfate
A synthetic surfactant that removes oil and dirt through emulsification and suspension
Best For Skin Types
Oily, Combination
Addresses
Usage Frequency
Daily or as needed
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What Is Ammonium Laureth Sulfate?
Ammonium laureth sulfate is a synthetic surfactant—a cleaning agent made by chemically modifying lauryl alcohol. It belongs to the sulfate family of surfactants, which are particularly effective at breaking down oils and removing dirt from skin. In skincare, it appears in a small fraction of products, primarily in cleansers.
The ingredient works by reducing the surface tension between water and oils, allowing them to mix and rinse away easily. This makes it a practical choice for formulations designed to cleanse oily skin or remove makeup and sebum.
How It Works
Ammonium laureth sulfate is a surfactant, meaning its molecular structure has both water-loving and oil-loving ends. When applied to skin, these molecules surround oily substances and suspend them in water, allowing them to be rinsed away. Research on similar surfactants suggests two primary mechanisms: emulsification (breaking oils into smaller droplets that mix with water) and roll-up (where the surfactant lifts oils away from the skin surface).
The effectiveness of this process depends on how strongly the surfactant binds to skin lipids and how readily it can suspend oils without leaving residue.
Clinical Evidence & References
Research comparing sulfate surfactants like ammonium laureth sulfate with other cleansing agents shows they are effective at removing oils and dirt from skin models. Studies using liposomes and lipid monolayers—which mimic skin barrier structure—indicate that sulfate surfactants interact significantly with skin lipids, confirming their cleansing power.
However, this same interaction with skin lipids also raises questions about whether repeated use might affect the skin barrier in sensitive individuals. Most available research focuses on acute effects rather than long-term use patterns in real-world skincare routines.
How to Use
Ammonium laureth sulfate is typically used as a cleanser: apply to damp skin, massage gently, and rinse thoroughly with water. Because it is an effective degreaser, it works well for oily or combination skin, but those with dry or sensitive skin may find it too stripping if used twice daily. Consider alternating with a gentler cleanser, or limit use to once daily in the evening.
Safety & Precautions
Frequently Asked Questions
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