Ingredient

Ammonium Lauryl Sulfate

Ammonium Lauryl Sulfate (ALS) is an anionic cleansing and foaming surfactant used in shampoos, body washes, and bath products, where it creates a creamy, luxurious lather.

Key facts

INCI name: Ammonium Lauryl Sulfate
Evidence grade: moderate evidence
In our catalog: Found in 14 of the 1,914 products we've decoded
Reviewed: July 2, 2026

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Good to know

Sulfatenote

An effective cleanser that can be stripping for very dry skin or curly hair.

What it does

moderate evidence

It is chemically close to the harsh-reputation SLS, but the ammonium counter-ion makes it somewhat milder. Its irritancy is concentration-dependent, and it is a cleansing agent rather than a leave-on skin active.

Benefits

Effective cleanser that dissolves both oily and water-based soils
Creates a creamy, luxurious, high-foam lather
The ammonium form is milder than its close relative SLS
Generally regarded as safe in brief, rinse-off use followed by thorough rinsing

Side effects

Irritation is concentration-dependent: below about 1% it is essentially non-irritating, but above ~10% it can cause moderate to strong irritation
Can be drying and may cause scalp itching, eye irritation, or, rarely, allergic reactions
Best limited to short-contact, rinse-off products rather than prolonged or leave-on use

Who it's for

Normal to oily skin and general body or hair cleansing where a rich foam is wanted, in well-formulated rinse-off products

Who should be careful

Dry, sensitive, or eczema-prone skin may prefer gentler or sulfate-free cleansers; avoid high concentrations and prolonged contact, and keep out of eyes