Sulfates in Face Wash: Do You Need a Sulfate-Free Cleanser?

The main sulfate-free face wash benefit is less stripping. Sodium lauryl sulfate (SLS) is the standard irritant researchers use to damage skin on purpose in studies, so people with dry, sensitive or easily irritated skin often feel better with a cleanser built on milder surfactants. How harsh a cleanser is, though, depends on the whole formula, its pH and how you use it.

Here is what sulfates do, how SLS differs from sodium laureth sulfate (SLES), which gentler surfactants show up in sulfate-free cleansers and what their own downsides are, and how to tell whether your face wash is too harsh for you. This guide covers facial cleansers only.

What are sulfates in face wash?

Sulfates are surfactants, the ingredients that let water lift oil, sunscreen and grime off your skin. They clean well and lather generously, which is a big part of their appeal. The two you'll see most often on a label are sodium lauryl sulfate and sodium laureth sulfate; ammonium lauryl sulfate and sodium coco-sulfate are close relatives.

Every surfactant interacts with the skin to some degree. A review of cleanser science by Unilever researchers explains that harsh surfactants can damage skin proteins and lipids, leading to after-wash tightness, dryness, barrier damage, irritation and even itch. The question is how much a given cleanser does that, and sulfates sit at the stronger end of the range.

What is the difference between sodium lauryl sulfate and sodium laureth sulfate?

SLS and SLES are close relatives. SLES is made by ethoxylating the same base molecule, which adds a short chain and makes it bulkier. Both can irritate skin on their own, and the evidence on each looks like this:

• Sodium lauryl sulfate (SLS), also called sodium dodecyl sulfate, is so reliably irritating that it has become the most widely used model for studying acute and cumulative skin irritation, according to a review in Contact Dermatitis. Researchers apply it to skin precisely because it disrupts the barrier in a predictable way.
• Sodium laureth sulfate (SLES) was reviewed by the Cosmetic Ingredient Review (CIR) Expert Panel, which found it to be a dermal and ocular irritant but not a sensitizer. The panel added that these ingredients are not regularly seen to be irritating in practice because of the formulations in which they are used, and should be used only when they can be formulated to be nonirritating.

That last point matters for anyone reading labels. Seeing SLES on a face wash doesn't make it harsh by default, and seeing a gentler-sounding surfactant doesn't make it mild.

Are sulfates bad for skin?

Plenty of people use sulfate cleansers without trouble, though sulfates are more likely than milder surfactants to leave skin dry or irritated, especially skin that is already dry or sensitive. Irritation is a sliding scale: the stronger the surfactant, the higher the concentration and the longer it sits on skin, the more it can disturb the barrier.

Two other factors change the picture:

• pH. The same Unilever review reports that high-pH (pH 10) solutions, even without surfactants, made the outer skin layer swell and changed its lipids, suggesting that cleansers with a neutral or acidic pH close to the skin's normal 5.5 may be less damaging.
• Soap versus syndet. A 2018 review in the Journal of Cosmetic Dermatology explains that cleansers are built either on alkaline soaps or on synthetic detergents called syndets, and that syndets cause less irritation and dryness because they are less likely to denature skin proteins.

Why does the whole formula matter more than one ingredient?

Because the other ingredients change how the surfactant behaves. Formulators rarely use one surfactant alone. They blend a primary cleanser with secondary surfactants and add ingredients that protect the skin during the wash. The cleanser review found that mildness enhancers and moisturizing agents such as lipids, occlusives and humectants reduce damaging interactions between surfactants and skin, and help replace lipids lost while washing.

So a sulfate cleanser buffered with glycerin, oils and a skin-friendly pH can feel gentler than a sulfate-free one with a high pH and a lot of fragrance. If you want to understand what else is in your cleanser, our guide on how to read skincare ingredient labels walks through the order and the common names.

What are the gentle alternatives to sulfates?

Sulfate-free cleansers use other surfactant families. Cleanser researchers describe several surfactants and blends as "less irritating" because they interact less with skin proteins. Some carry a different risk: a small number of people develop an allergy to them. The table sums up the ones you'll meet most often.

The allergy details come from contact dermatitis research. Cocamidopropyl betaine is an amphoteric detergent used widely because it induces relatively mild skin irritation, but sensitization is estimated at between 3.0% and 7.2%, and rising rates led to it being named Allergen of the Year in 2004. Manufacturing impurities such as amidoamine are thought to play a role. In North American Contact Dermatitis Group data from 2001, 15 of 975 patients tested were positive to cocamidopropyl betaine alone, and 18 reacted to both it and amidoamine, most often on the head and neck. Alkyl glucosides, the sugar-based surfactants such as decyl glucoside, were named the 2017 Allergen of the Year in the journal Dermatitis.

Keep the numbers in proportion: those figures come from people referred for patch testing, who already had suspected allergies. Most people use these surfactants without trouble. If your skin itches or flares every time you use a particular cleanser, a dermatologist can patch test to find the cause.

Who benefits from a sulfate-free cleanser?

People whose skin is already dry, sensitive or irritated get the most out of it. You're a good candidate if any of these apply:

• Your face feels tight, squeaky or itchy within a few minutes of washing.
• Moisturizer or sunscreen stings right after you cleanse.
• You use a retinoid, exfoliating acid or benzoyl peroxide and your skin is already feeling dry from it.
• You have eczema, rosacea or a damaged skin barrier. Gentle cleansing helps, but these conditions deserve a dermatologist's care if they're not settling.
• You live in a cold, dry climate or wash more than twice a day because of workouts.

If your skin is oily, comfortable after washing and not reacting to anything, a well-formulated sulfate cleanser may suit you fine. Switching is optional; it's worth trying when your current routine leaves your skin feeling worse.

What should I look for in a sulfate-free cleanser for dry skin?

For dry skin, look for a cream, lotion or milky cleanser that leaves your face feeling soft and comfortable. Practical checks:

1. Little or no lather. In its bathing tips for dry skin, the AAD advises people to use enough cleanser to remove dirt and oil but avoid so much that you see a thick lather.
2. Humectants and lipids in the formula, such as glycerin, ceramides or plant oils, which are the moisturizing agents the cleanser research found reduce surfactant damage.
3. No added fragrance if your skin is also sensitive. See our guide to fragrance and essential oils for why.
4. Good habits around the wash. The AAD recommends a gentle, non-abrasive, alcohol-free cleanser, lukewarm water and your fingertips, and washing no more than twice a day and after sweating.

Then follow with moisturizer. For a full plan built around this, read our dry skin routine.

How do I know if my face wash is too harsh?

Your skin tells you within a minute or two of rinsing. Tightness, a squeaky feel, stinging when you apply your next product, flaking around the nose and mouth, or redness that fades over half an hour all point to a cleanser that's taking too much. A simple test:

1. Wash with your current cleanser and apply nothing for 10 minutes. Note how your skin feels.
2. Switch to a gentle, sulfate-free cream or lotion cleanser for two weeks, keeping everything else in your routine the same.
3. Repeat the 10-minute check. If the tightness is gone and your moisturizer no longer stings, the old cleanser was too strong for your skin.

Change one product at a time so you know what made the difference. Our guide on introducing new skincare products explains how.

How can an ingredient scanner help?

Surfactant names are long and easy to mix up, and "sulfate-free" on the front of a bottle doesn't tell you what's on the back. The ingredient scanner in Pori (part of Pro) lets you scan a barcode or photograph a label and flags each ingredient on its curated list of about 250 INCI ingredients as beneficial, use with caution or avoid for your skin type. The flags come from fixed rules; the AI only reads hard-to-read labels and summarizes. Barcode data comes from Pori's catalogue plus Open Beauty Facts, so some US products may be missing. If you want to see whether a gentler cleanser changes how your skin looks over a few weeks, a selfie scan gives you a Hydration & Moisture score you can compare over time. As of October 2026, Pori is a free iPhone download with a free first scan; Pro is $9.99 a week with a 3-day trial for eligible Apple IDs, or $49.99 a year.

An app is not a diagnosis. If your skin stays red, itchy or flaky after you've switched to a gentle cleanser, see a dermatologist.