SLS vs SLES

Sodium lauryl sulfate, often shortened to SLS, and sodium laureth sulfate, or SLES, are anionic surfactants used in cleansing products. They are related but chemically different.

SLS

SLS is an effective detergent and foaming surfactant. It is used in personal care, oral care, and cleaning products depending on the formula.

SLES

SLES is produced by adding ethoxy groups to a related fatty alcohol before sulfation. That changes its properties and formulation behavior.

Finished formulas matter

Irritation potential depends on concentration, contact time, other surfactants, pH, and the full formula. Comparing one ingredient name outside the formula can be misleading.

Use the label for preference, not fear

If you prefer sulfate-free products, look for the claim and ingredient list. If SLS or SLES works well for you in a finished product, the ingredient name alone is not a reason to assume a problem.

Quick checklist

Use the product label, manufacturer directions, and the specific requirements of your situation. Compare the complete product or system rather than making a decision from one marketing phrase, ingredient, or number.