What is sodium lauryl sulfate and should you ban it from your beauty routine?

Sodium lauryl sulfate is found in lots of products—from your beauty kit to the kitchen cupboard—but what does it do, and why do people avoid it?

sodium lauryl sulfate main image of foam suds
(Image credit: Getty Images)

Sodium lauryl sulfate is a common ingredient found in many beauty and household products, but why is it so popular? And why are so many people against it?

You might find the best shampoo and conditioner for your hair type or the best cleanser for your skin type, but notice that sodium lauryl sulfate is listed as part of the formula. If you follow the curly girl method or subscribe to clean beauty, this will instantly put your new fave product on a banned list. We look at what sodium lauryl sulfate actually is and examine why it's controversial, so you can decide if this ingredient belongs in your haircare and skincare routine

What is sodium lauryl sulfate?

Sodium lauryl sulfate (or SLS) is a surfactant. All surfactants are partly water-soluble and partly oil-soluble. As a result, a surfactant is a compound that allows water and oil molecules to bind together. Water and oil don't naturally mix, yet the majority of topical beauty and cleaning products include both of these elements in their formula, which is why surfactants are popular ingredients too. 

Sodium lauryl sulfate is what creates lather in cleaning and beauty products, and ultimately helps loosen dirt so that water washes it away. The surfactant emulsifies with any sebum, grease, and dirt it comes into contact with, allowing them to be rinsed off.

Primarily used for cleaning either in the kitchen or in beauty products, It's commonly found in soaps, shampoos, cleansers, and other products designed to dissolve dirt. Typically it is an opaque, thick liquid, but that can vary depending on the concentration used. 

Sodium lauryl sulfate is a popular surfactant because it is cheap, readily available, and safe to use in cosmetic, dermatological and household products.

Where you'll find SLS

Sodium lauryl sulfate is found in most cleansing skincare and haircare products, and some makeup items too—even the best lip balms out there can contain SLS. If you look in your bathroom, you probably have quite a few products that contain it. It is used in health and beauty products as well as some of the best skincare products and the best body exfoliators. Typically expect to see it in:

  • Face and skincare products: in the best facial washes, face masks, lotions, shaving creams, liquid soaps, exfoliating cleansers, and lip balm 
  • Dental products: toothpaste, mouthwash, and tooth whitener
  • Haircare products: shampoo, conditioner, styling cream, and hair dye 
  • Bath and body care products: body wash, bubble bath, bath salts, bath oils, suntan lotion, and hair removal creams 

Does sodium lauryl sulfate have side effects?

Sodium lauryl sulfate has the very obvious benefit of removing any grim that might have formed on your hair, teeth, or skin. But are there any downsides to using it within your beauty regimen?

The most recent assessment of sodium lauryl sulfate safety in cosmetics was completed in 1983 by the International Journal of Toxicology. They assessed it as not harmful if applied briefly and removed from the body (as you would with shampoos and soaps). There is evidence that if left on the body for too long, it may cause mild irritation to your skin barrier, but it is still considered safe for everyday use. The report states that products that are required to stay on the skin longer shouldn’t exceed 1 percent concentration of SLS.

SLS is a known irritant. Researchers from Germany tested 1,600 patients for how sensitive they were to sodium lauryl sulfate and found 42% of the patients tested had an irritant reaction. This percentage increased when hot water was used in the washing process. But because most SLS products are designed to be removed after short applications, the risks are minimal.

It's important to note that there’s no scientific evidence that SLS causes cancer. It is not a known carcinogen.

When to use SLS (and when not to)

Although sodium lauryl sulfate is safe in most scenarios, you should discontinue use if you find any signs of irritation. If you have red, dry, scaly, itchy, or sore skin in areas where you have used products with sodium lauryl sulfate, discontinue use immediately.

Furthermore, people with sensitive skin, or who live with skin conditions such as eczema, rosacea, and psoriasis, are best to avoid SLS. And if you have very dry or dehydrated skin you should proceed tentatively as sodium lauryl sulfate can exacerbate dryness. 

How do you use and apply sodium lauryl sulfate?

As always, we recommend that you read the directions on the label, as applications will differ from product to product. But remember these two rules when applying products containing SLS and your risk of experiencing irritation will be minimized: 

  1. Rinse products off quickly after use
  2. If you are using a product that will stay on your skin make sure it does not contain  more than the recommended dose of 1%

Are there products without sodium lauryl sulfate?

Yes! While SLS compounds are perfectly safe to use and rinse off, if you're experiencing irritation from usage or subscribe to a regime that doesn't permit them, there are lots of sulfate-free alternatives on the market. 

You might already be buying sulfate-free products and not even realizing it, as many top brands have developed sulfate-free ranges. One noticeable difference to note that takes getting used to though is the lack of lathering in these products. Don't let that tempt you into using more than the normal amount of product, as disconcerting as a foam-free clean is... 

Our beauty editor's sulfate-free picks

Ursa Major Fantastic Face Wash | RRP: $30/£24 This popular sulfate-free face wash is refreshing even without a lather thanks to the addition of spearmint. It gently cleanses without stripping the moisture or throwing off your pH balance. It's suitable for all skin types.

Ursa Major Fantastic Face Wash | RRP: $30/£24

This popular sulfate-free face wash is refreshing even without a lather thanks to the addition of spearmint. It gently cleanses without stripping the moisture or throwing off your pH balance. It's suitable for all skin types.

Rahua Classic Shampoo | RRP: $36/£34 This shampoo is formulated with omega-9 Rahua oil and works to strengthen weak hair. It smells like Palo Santo oil and woods and leaves hair just the right level of shiny and moisturized. 

Rahua Classic Shampoo | RRP: $36/£34

This shampoo is formulated with omega-9 Rahua oil and works to strengthen weak hair. It smells like Palo Santo oil and woods and leaves hair just the right level of shiny and moisturized. 

whiten teeth

Sensodyne True White Extra Fresh Toothpaste | RRP: $14.95/£7.19

While working to both whiten teeth and remove stains from teeth, this toothpaste is built for those with sensitive teeth and gums. Potassium nitrate and sodium fluoride are the active ingredients in this toothpaste, keeping it SLS-free.

Eunice Lucero-Lee
Eunice Lucero-Lee

Eunice Lucero-Lee is the Beauty Channel Editor for woman&home. A lifelong creative writer and beautyphile, she graduated from De La Salle University in 2002 and was hired a year later to front all beauty coverage for Pink Magazine, a teen lifestyle publication, after submitting a page-long thesis on why Stila was the best brand to come out of the Aughts. She was hired an hour later. 


Her writing—which has since then expanded to cover pop culture and astrology, both equal passions—led her to spearheading columns in Chalk Magazine, K-Mag, Metro Working Mom, and SugarSugar Magazine. Upon receiving her stripes at New York University’s Summer Publishing Institute in 2008 she was immediately headhunted to work as the Beauty Editor, thereafter Managing Editor of Stylebible.ph, the digital home of Preview, the Philippines’ best-selling fashion magazine, where she also did double-duty as Associate Editor of the print edition.


It was during this stint that the hallyu wave started taking hold and when she was tapped to co-found Sparkling, Asia’s first-ever English K-Pop print magazine. Originally planned as a one-off, the project became a runaway hit and saw her taking Korean classes on the weekends for three years, as she found herself frustrated by the lack of breadth translators provided for celebrity profile coverage. She was Editor-in-Chief until her move to New York in 2013. The now-iconic magazine has remained in publication since 2009 due to massive fan support.


A beauty, astrology, and pop culture obsessive and insider for over 18 years, Eunice is an internationally published editor (and now certified astrologer) whose work has been featured in publications such as Cosmopolitan, Esquire, and The Numinous, among many others. The former Editor-in-Chief of All Things Hair and a (very) proud cat mom, she spends her time in Manhattan figuring out the correct Pilates-to-sushi ratio, obsessing over celebrity natal charts, luxury skincare, and Scandi-noir crime procedurals, as well as finding the perfect K-Pop vid to save the day. She can still order drinks perfectly in Korean. Find her on Instagram @eunichiban.