Ingredient review

Sodium Laureth Sulfate

INCI: Sodium Laureth Sulfate

An effective foaming cleanser that can be drying or irritating for sensitive skin, but is generally safe in rinse-off products.

beautyskincarecleanser

In plain English

Sodium Laureth Sulfate (SLES) is a surfactant, which means it helps water mix with oil and dirt so they can be rinsed away. It's what makes shampoos and body washes foam up. While it's a very effective cleaner, it can strip the skin of its natural oils, potentially leading to dryness or irritation, especially for those with sensitive skin. It is often confused with Sodium Lauryl Sulfate (SLS), but SLES is considered milder.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

Potentially useful with some tradeoffs

The evidence base is relatively strong for its common cosmetic role.

Main practical flags: irritation is moderate; clogging risk is low.

Source
synthetic
Evidence
strong
Irritation
moderate
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Sodium Laureth Sulfate can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Sodium Laureth Sulfate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

strong

There is a stronger practical or research basis for the ingredient role described here.

What it is

A synthetic surfactant derived from coconut or palm oil through a process called ethoxylation. It is a milder alternative to Sodium Lauryl Sulfate (SLS).

How it works

It reduces the surface tension of water, allowing it to penetrate oils and dirt on the skin and hair. This action lifts impurities so they can be easily washed away with water.

Pros

Excellent cleanser

Effectively removes excess oil, dirt, and makeup, leaving skin feeling clean.

Milder than SLS

Compared to Sodium Lauryl Sulfate, SLES is less irritating to the skin and eyes, making it a more common choice in personal care.

Cons and cautions

Can be drying

For people with dry or sensitive skin, SLES can strip away too much natural moisture, leading to tightness and irritation.

Potential contaminant concern

The manufacturing process can create trace amounts of 1,4-dioxane, a possible carcinogen. However, reputable manufacturers purify the ingredient to keep levels very low.

Best for

  • People with normal to oily skin
  • Those who prefer a foaming cleanser

Use caution if

  • Individuals with very dry, sensitive, or eczema-prone skin
  • Those who avoid synthetic surfactants

Usage tips

Use a moisturizer after cleansing to replenish any lost hydration.
If your skin feels tight after washing, switch to a sulfate-free cleanser.

Safety summary

Sodium Laureth Sulfate is considered safe for use in rinse-off cosmetics at typical concentrations. The main concern is its potential for skin irritation, which is higher than milder surfactants but lower than SLS. The trace contaminant 1,4-dioxane is monitored and minimized in quality manufacturing.

Research notes

Extensive research supports the safety of SLES in cosmetics. Studies focus on its skin irritation potential and the minimization of 1,4-dioxane. Regulatory bodies worldwide deem it safe for its intended use.

Common label clues

Typical concentration
1% to 30% depending on product type
Regulatory status
Approved for use in cosmetics by the FDA and the European Commission. Levels of 1,4-dioxane are regulated as a contaminant.
Common uses
Shampoos, Body washes, Facial cleansers, Liquid soaps
Environmental note
SLES is biodegradable, but its production from palm oil can contribute to deforestation if not sourced sustainably.

Good to know

  • SLES is often confused with SLS. SLES is generally considered the gentler of the two.
  • Look for products labeled 'sulfate-free' if you want to avoid SLES entirely.

Common questions

What is Sodium Laureth Sulfate in beauty products?

Sodium Laureth Sulfate (SLES) is a surfactant, which means it helps water mix with oil and dirt so they can be rinsed away. It's what makes shampoos and body washes foam up. While it's a very effective cleaner, it can strip the skin of its natural oils, potentially leading to dryness or irritation, especially for those with sensitive skin. It is often confused with Sodium Lauryl Sulfate (SLS), but SLES is considered milder.

What does Sodium Laureth Sulfate do in a beauty product?

It reduces the surface tension of water, allowing it to penetrate oils and dirt on the skin and hair. This action lifts impurities so they can be easily washed away with water.

Is Sodium Laureth Sulfate safe for most people?

Sodium Laureth Sulfate is considered safe for use in rinse-off cosmetics at typical concentrations. The main concern is its potential for skin irritation, which is higher than milder surfactants but lower than SLS. The trace contaminant 1,4-dioxane is monitored and minimized in quality manufacturing.

Who should be careful with Sodium Laureth Sulfate?

Individuals with very dry, sensitive, or eczema-prone skin Those who avoid synthetic surfactants

Research sources

Cosmetic Ingredient Review (CIR) Safety AssessmentOpenFDA on 1,4-DioxaneOpenPubMed: Skin irritation potential of SLESOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.