Ammonium Laureth Sulfate vs Sodium Laureth Sulfate: which is worse?

What is Ammonium Laureth Sulfate?

Ammonium laureth sulfate is an anionic surfactant very similar in structure to SLES but uses an ammonium counterion instead of sodium. It produces abundant foam and provides excellent conditioning to the hair shaft during washing.

What is Sodium Laureth Sulfate?

Sodium laureth sulfate (SLES) is an anionic surfactant derived from ethoxylated lauryl alcohol, widely used as a primary lathering and cleansing agent. It is milder than its close relative SLS because the ethoxylation process reduces skin irritation potential. SLES is one of the most common cosmetic surfactants globally.

Documented risks

Ammonium Laureth Sulfate: Ammonium laureth sulfate shares a similar safety profile to SLES. The CIR has concluded it is safe for cosmetic use. Like SLES, it may contain trace 1,4-dioxane from ethoxylation, addressed by standard manufacturing controls. It is not a carcinogen or endocrine disruptor. Mild skin irritation is possible in sensitive individuals at high concentrations but is not a concern at typical use levels in rinse-off products.

Sodium Laureth Sulfate: SLES is broadly considered safe at cosmetic use levels (typically 1–20%). The Cosmetic Ingredient Review (CIR) Expert Panel concluded it is safe as used in rinse-off products. A known manufacturing byproduct, 1,4-dioxane, can appear at trace levels; reputable manufacturers use vacuum-stripping to minimize it below regulatory limits. SLES does not penetrate intact skin significantly and is not a carcinogen or systemic toxin. Some individuals with very sensitive or eczema-prone skin may experience mild irritation at higher concentrations; this resolves upon rinsing. It is not a hormone disruptor and does not accumulate in the body.