Is it the same as sodium lauryl sulfate?

No. This is the ethoxylated version, with a larger and better-hydrated head that interacts less with skin proteins. Same class and same job, but the shorter name is not a nickname for this one and the two do not behave alike.

Does it damage the skin barrier?

Any effective cleanser can, and how much depends on contact time, frequency, water temperature and the rest of the blend rather than on the name. Tightness after washing is the signal to change something.

What about 1,4-dioxane?

It is a trace by-product of ethoxylation rather than an added ingredient, and manufacturing is designed to remove it. What level is permitted in a finished product is set by each market and revised, so the current local rule is the reference — not a figure quoted second-hand.

Is sulfate-free automatically better?

No. Most sulfate-free cleansers use other anionic surfactants, and a badly built sulfate-free formula can be harsher than a well-built one containing a sulfate. The blend decides, not the absence of one word.

Is it safe during pregnancy?

We have left this unknown rather than guess. It is a rinse-off cleansing agent rather than an active, but we have not verified a pregnancy-specific assessment for it, so a question about a particular product belongs with a clinician.

Sodium Laureth Sulfate — Ingredient Guide

How it works

Sodium laureth sulfate is a fatty alcohol — usually of coconut or palm origin — that has had a short chain of ethylene oxide units attached and then a sulfate group placed on the end. The result is an anionic surfactant: a negatively charged head on a fat-soluble tail, the arrangement that lifts oil and debris off skin and hair and foams generously while doing it.

Those inserted units are the whole difference between it and sodium lauryl sulfate. They make the head bulkier and hold water around it, so the molecule packs less tightly against the proteins of the outermost skin layer. Same class, same job, gentler contact — which is why two materials that behave differently get discussed as one. The number of units is not fixed either: laureth is a family, and a supplier's grade is a distribution rather than one molecule.

The evidence

That it cleans is not in dispute. What has been examined at length is irritation, and there the reliable finding is comparative rather than absolute: this is the milder of the two familiar sulfates, and how harsh a wash feels depends far more on the system than on this name. Contact time, frequency, water temperature and the secondary surfactants beside it move the result more than the sulfate does.

The other question attached to it is 1,4-dioxane, a by-product that can form during ethoxylation. Nobody adds it; it is a trace that manufacturing is designed to strip out, and how much may remain in a finished cosmetic is set by each market and has been revised. That makes it a specification question for the supplier and the regulator rather than something readable from a label, and no number belongs on this page.

Suitability

Fine for skin that gets on well with a foaming wash
Dry, eczema-prone and reactive skin usually does better on a lower-foam system
Short contact — apply, work, rinse — matters more than any percentage
Common in face washes, body washes and shampoos, not in leave-on products

Concentration

No figure, and one would mislead. The level follows the format and the rest of the blend; a mild co-surfactant changes the outcome more than a couple of points either way, and a rinse-off product's exposure is decided by contact time rather than concentration. Brands do not publish it and the ingredient list does not reveal it.

Conflicts & combinations

It cannot share a water phase with a cationic conditioning agent — opposite charges form an insoluble complex and both are wasted, which is why conditioning arrives as a separate step. The useful pairing is with an amphoteric or a sugar-based nonionic, and that is how most modern formulas soften it. On skin the thing to watch is stacking: a foaming sulfate wash under an acid, a retinoid or a scrub removes more than any one of them intends.