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Article

Is Sodium Lauryl Sulfate in my Shampoo Toxic or Dangerous?

There has been a rising concern over the man-made chemical sodium lauryl sulfate, commonly used in soaps and cleaners like shampoo. Is your shampoo really safe?

Take a minute to collect together your shampoo, hand soap, dish soap, laundry detergent, toothpaste, shaving cream, mouth wash, and if you’ve got it about, perhaps some industrial strength garage cleaner. Flip them over and read the ingredients listed on the back. It is likely that they all have something in common: sodium lauryl sulfate (SLS), also known as sodium dodecyl sulfate (SDS). You may also come across sodium-coco sulfate, which is almost the same chemical, just slightly less processed industrially.

You may have already heard of these, and if you throw the term “sodium lauryl sulfate” into Google it will return loads of articles full of warnings, with words like toxins, carcinogens, cancer, and other evils.

Some sound more researched, while others clearly have no sense of what they are talking about. Looking at it from the perspective of a molecular biologist, it comes across as a bit sensationalist to me, and I think it is important to bring a bit of fact-based truth to the issue. So, is your shampoo causing you harm?

Showering with danger — Source

What is Sodium Lauryl Sulfate?

Sodium lauryl sulfate is derived from coconut plants, and is then processed into the very popular cleaning agent.

A simple explanation of the chemical is that it has a fatty acid chain on one end of the molecule, attached to a long carbon chain that makes up a salt on the other end of the molecule.

The fatty acid end will pick up fats, such as oils in hair, while the salt end will dissolve in water. This helps wash away dirt saturated oils, when you rinse shampoo out of your hair or soap off of your hands.

It is quite a nifty and effective chemical. It is abundant enough, and is easily and cheaply attained, which is why it has become so ubiquitous in all types of cleaners and soaps.

This chemical’s ability to remove oils so easily is also why it is found in laundry and dish soaps, as well as in industrial strength cleaning supplies used in places like an auto repair shop.

It is worth noting that just because this same chemical is also used in harsher cleaners, they are by no means used in the same concentration. The chemical is found in a far more diluted form in domestic products.

 A critique of sodium lauryl sulfate in domestic products is that it strips your hair or skin of natural oils, which can leave it very dry. This brings about the need for conditioners and lotions that then replace natural oils with synthetic oils.

While this critique is worth bearing for persons concerned with natural, or organic health and beauty care, it does not mean washing with a soap containing sodium lauryl sulfate is hazardous to your health. And similarly, many of the completely natural products can be equally drying.

Is Sodium Lauryl Sulfate Dangerous?

In terms of causing health problems, it is not dangerous.

Sodium lauryl sulfate and related chemicals have been shown through clinical trials to be non-toxic, and are not carcinogenic (or cancer causing).

So, if you’ve been reading up on SLS, and similar chemicals, and you’ve been told you are pouring toxins all over your skin and hair, clinical trials show that statement to be totally incorrect.

Most toothpastes also contain SLS — Source

While SLS is not a toxin, and won’t cause cancer, it is a known irritant. As per warnings on products, it can cause irritation to the skin and eyes. There has also been some indication that toothpastes containing sodium lauryl sulfate may be linked to canker sores in the mouth, in sensitive individuals.

But, that does not mean there is need for concern. Being a known irritant means it is just that- it is something that may or may not cause irritation to sensitive individuals. Grass is also a known irritant.

Sodium Laureth Sulfate (SLES) and Sodium Lauryl Sulfate (SLS) are not the same.

They are similar in function, and somewhat similar in structure, but sodium lauryl sulfates (SLS) are not the same as sodium laureth sulfates (SLES), either of which can be found in any of the listed products.

Sodium laureth sulfate is generally not considered to be any more or less dangerous than sodium lauryl sulfate by itself, but SLES can become contaminated with dioxane, which is a known carcinogen. Reports have shown that low levels of dioxane can be traced in domestic products containing sodium laureth sulfate (SLES).


It would not be a waste of time to avoid products containing sodium laureth sulfate.

A shampoo I found in my shower.
2nd ingredient is SLS, 3rd is SLES

Would I recommend avoiding domestic products containing Sodium Lauryl Sulfate?

Some of the products I use do have SLS, and some do not.

My face soap is hand-made, because I have a lot of problems with acne. So, it doesn’t contain any of these chemicals.  But, my hand soap is whatever is on sale at the drug store around the corner.

Personally, most shampoos make my head itch, and cause dandruff. I found significant improvement after switching to a shampoo that does not contain sodium lauryl sulfate.

It turns out sodium-coco sulfates do not cause itching problems for me, so products containing this form of the chemical work just fine for me. The shampoo I prefer is the ‘Say Yes to Carrots,’ which contains sodium-coco sulfate. I also prefer this shampoo because it is cruelty and paraben free.

Allafia- An all natural hair care line
Allafia contains all natural oils and plant-based ingredients

There is an ever-growing market for those with similar sensitivity issues, or those who simply want to go a more all-natural rout.

With the advent of using natural, organic health and beauty products quickly approaching a mainstream norm, there many new product lines such as Bert’s Bees, or Alba, as well as long standing products such as the very popular Dr. Bronner’s Magic soaps, frequently showing up in many chain stores.

All of these products are free of man-made chemicals. But, the more natural products do tend to be significantly more expensive than a typical product found in a drug store, or grocery store aisle.

In the end, if your favorite shampoo, mouthwash, or other soaps and hygiene products contains SLS, but has never caused problems with severe dryness or irritation, then there is no pressing health problem. You are safe to keep using it. It isn’t going to kill you.

A man and his shampoo.

Do you think sodium lauryl sulfate is something to worry about?

51 votes

Updated September 20, 2012

Comments

EmberOct 28, 2014

othellos- If you've been using the brand and are happy with it, then there is honestly no reason to switch :)

ologsinquito- Awww! I just saw that you pinned it, thank you so much!! <3 What shampoo do you use?

Rose- fair enough that it's really only a problem if it is causing you problems, like dandruff or itchy scalp

ologsinquitoMay 15, 2014

I use a shampoo without this toxin as well. This is a great article. I'm voting up and pinning it.

RoseNov 23, 2013

I didn't even realize that sodium laurel sulfate was a problem. Am off to check the shampoos in my bathroom

EmberAug 24, 2013

Natural_Skin_Care- Yes that is true! I've even found some which I'm fond of where I work.

WriterArtist- Yes they are! Thank you for reading :)

WriterArtistAug 24, 2013

These two names Sodium Laureth Sulfate (SLES) and Sodium Lauryl Sulfate (SLS) are so confusing. Thanks for throwing light on them.

Natural_Skin_CareJul 12, 2013

The good news is that there are so many organic shampoos available.

EmberJun 11, 2013

Thank you for the comments everyone!

Chris-I did talk about how SLES can become contaminated with dioxane, and that it had been traced in household products. That is SLES specifically. SLS is structurally different to SLES and doesn't become contaminated with dioxane like SLES can.

SimplySara- The bad guy here would be the SLES. I know it can be so confusing to keep track of it!

Getthefactsnothype-thanks!

tolovaj- Yes! And yes there are a lot of chemicals in the world...really when you break it down, everything is a chemical or multiple chemicals.

Sam- Thanks! I had several afternoons of reading after my mom gave me a rant about shampoos. I already knew what SLS was but it took reading clinical trials to know what, if any, potential dangers surrounded it.

Jo- :p (this is really really really laaaaaaate, but thanks!)

ChrisJun 9, 2013

During the manufacturing process, SLS can definitely be contamined with 1,4 Dioxane, which definitely IS a carcinogen. Please don't say that the only problem with SLS and SLES are sensitivity isses, because it is a known fact of the contamination problem.

katiem2May 2, 2013

I think PG is added to anti freeze and is added in small doses to maintain moisture, it is also added to foods you know those label soft!!!

SimplySaraFeb 11, 2013

I'm kinda of confused about which is the bad guy: Sodium Laureth Sulfate (SLES), or Sodium Lauryl Sulfate (SLS)?

TolovajSep 27, 2012

It's always good to read the tiny letters - even on the shampoo. And it is always good to get second (and sometimes third...) opinion. World is loaded with chemicals and only few of them are really dangerous, but we have to be critical to all of them.
Thumbs up!

SamSep 26, 2012

Great to see an article that really goes into the details and the why and how plus the scientific background - well done! SY

JoHarringtonSep 24, 2012

Look at you on the front page of Wizzley!

EmberSep 24, 2012

Yeah, it can be hard dealing with sensitivity issues, so I think it is great that there is such a large selection and variety of all natural products now.

You're welcome! And, thank you for the comment!

ThamisgithSep 22, 2012

My wife cannot use toothpaste with this in it. Not a problem for me and my sons though. She is clearly more sensitive to it than us.

I didn't know that it was in so many other products though. Thanks for the information.

EmberSep 21, 2012

Frankie- Thanks dad xP

Dustytoes- Thank you very much for the comment. I'm glad this came across clearly :)

katiem2- Thanks for the comment! You know, I have heard mention of it before, but I'm not sure what polyproylene glycol is, exactly...It is going to be some type of alcohol, and used in soaps as you said, but I don't know much past that as far as possible dangers without researching it. I know the first thing I think of is anti-freeze when I think of glycol. As far as soaps, an all natural product that can replace that in purpose is glycerol, which is similar but they are vegetable based, for example. I know I've seen things like vegetable glycerol for sale in organic/whole/natural based stores. Sometimes it can be hard to know whether something should be of concern. For example when I was researching for this, I came across people who would reference the MSDS (material safety data sheet), which will list what are called LD50 (the lethal dose it would take to kill on average 50% of the test population), so, yes SLS is listed with an LD50, but the thing about that is, even water has a lethal dose. It's knowing what a percentage means, and what way, and concentration that make the difference, but I understand the fright for someone whose never seen that before.

In general, you can't really go wrong with being chemical free. Especially with things like pesticides, and soooo many of the preservatives. One caution I think is important to have when going with all natural products is to remember that many poisons and radioactive elements are also 100% natural, and from the earth. And, the FDA (if you are in the US) does nothing to regulate almost any supplement. So, sometimes it is good to still be just as discerning, even when something tells you it is 100% natural and organic.

katiem2Sep 20, 2012

Thanks for the truth on this issue, I've often wondered about that I feel polypropylene glycol is a serious chemical also showing up in so many health and beauty products. Makes a person wonder. I try to do as much natural chemical free as possible. Just a matter of choice for me. Great article. :)K

dustytoesSep 20, 2012

Easy to understand info. I feel like I now know the truth. Great article.

FRAKIESep 20, 2012

KOOL I WONT DIE YET

EmberSep 19, 2012

You're welcome! Thank you for the comment ^.^

MiraSep 19, 2012

Thank you, Ember, for a useful article! It read very well, too, so I bet most people will read every word :-)

EmberSep 19, 2012

:D Thank you!

Also, qualified scientist xD

JoHarringtonSep 19, 2012

Yay for qualified scientists writing for Wizzley on this subject!

I love how you wrote this too. Even lay people like me could follow that so easily. Thanks for sharing this.

EmberSep 19, 2012

I think it is pretty common actually, all natural products seems to be growing into a very big deal! And, you are so right, labels can be so misleading. One of my flat-mates worked at a shop in San Francisco that supposedly sold all-natural products and when I was reading the labels of everything in our shower I had to laugh to myself because all of his very pricey shampoos aren't anymore natural than regualr shampoos.

I don't know a lot about parabens, but I did read a study they did with rats that had some pretty shocking rates of cancer development. From what I understand, they mimic estrogen, and can cause breast cancer. :/ Not good stuff.

Thank you for the comment! :D
Ember
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