Sodium Laureth Sulfate (SLES)

INCI: Sodium Laureth Sulfate

Ethoxylated version of SLS – gentler but still potentially irritating to sensitive skin. One of the most common surfactants in shampoos and shower gels.

Evidence by route

Topical application

Very weak or conflicting data.

A surfactant, not an active ingredient. Less irritating than SLS. CIR deemed safe. Concerns about 1,4-dioxane contamination are addressed – modern manufacturing keeps levels below the safety threshold.

Cosmetic Ingredient Review. Int J Toxicol. 2010;29(Suppl 4):151S-161S.

Tolerability and safety

Irritation potential

Medium

Allergen risk

Low

Pregnancy

Safe

Skin types

Suitable for

OilyNormalCombination

Use with caution

SensitiveDry

Frequently asked questions

Is Sodium Laureth Sulfate (SLES) safe during pregnancy?

Sodium Laureth Sulfate (SLES) is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.

What skin types is Sodium Laureth Sulfate (SLES) for?

Sodium Laureth Sulfate (SLES) suits: oily, normal, combination. Use with caution in: sensitive, dry.

Can Sodium Laureth Sulfate (SLES) irritate the skin?

Sodium Laureth Sulfate (SLES) has moderate irritation potential. Sensitive skin may show a transient reaction that usually settles with adaptation.