Ammonium Laureth Sulfate vs Ammonium Lauryl 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 Ammonium Lauryl Sulfate?

Ammonium lauryl sulfate is an anionic surfactant analogous to SLS but with an ammonium cation. It provides strong foaming and cleansing. It is slightly more water-soluble than SLS.

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.

Ammonium Lauryl Sulfate: ALS is slightly more irritating than ALES and comparable to SLS at equivalent concentrations. At typical shampoo concentrations (2–10%), it is considered safe by the CIR. It is not carcinogenic, not a hormone disruptor, and does not accumulate in body tissues. Prolonged skin contact at high concentrations can cause irritation; this is not a concern in rinse-off applications.