Sodium Laureth Sulfate (SLES).
Also known as: SLES, sodium lauryl ether sulfate, sodium laureth-2 sulfate, sodium myreth sulfate
An ethoxylated surfactant closely related to SLS but milder. SLES is the most widely used surfactant in shampoos and body washes globally. While less irritating than SLS, the ethoxylation manufacturing process can leave behind 1,4-dioxane, a probable human carcinogen.
By the numbers.
1 = low concern, 10 = avoid.
Risk by usage.
How risk shifts depending on how often you use products with Sodium Laureth Sulfate (SLES).
Low risk at standard cosmetic concentrations.
Daily exposure raises cumulative 1,4-dioxane and skin irritation concerns.
Moderate concern. Multiple SLES products compound contamination and irritation risk.
What the research says.
May be contaminated with 1,4-dioxane, a probable human carcinogen, as a byproduct of the ethoxylation process.
EPA — 1,4-dioxane classified as likely carcinogenic to humans
Can still irritate sensitive skin, though less aggressively than SLS.
Long-term use contributes to cumulative skin barrier weakening and dryness.
Global status.
How sodium laureth sulfate (sles) is regulated in cosmetics around the world.
The reason brands include it.
Produces generous lather with less irritation than SLS. Excellent at removing oil and dirt while being cost-effective.
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Better alternatives exist. Brands choose sodium laureth sulfate (sles) because it’s cheap and effective, but safer options like coco glucoside, decyl glucoside, sodium cocoyl isethionate deliver similar results without the health concerns.
Sodium Laureth Sulfate (SLES) in product types.
Click a category to see every product containing sodium laureth sulfate (sles).
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What to use instead.
What Numbrrrz uses instead
Numbrrrz is completely free of SLES and all ethoxylated surfactants — our simple four-ingredient formula needs no surfactants or foaming agents of any kind.