SLS vs SLSa: The Bubble Trouble That’s Got Everyone Confused
Updated: Sep 5
Whaaat?? SLS vs SLSa? Isn't SLSa just like a 1.01 version of SLS?
If you’ve ever stood in the skincare aisle squinting at an ingredient list, wondering whether Sodium Lauryl Sulfoacetate (SLSa) is just Sodium Lauryl Sulfate (SLS) wearing a fake moustache, you’re not alone.
The names are almost identical, but these two cleansing ingredients are surprisingly different. One has a reputation that precedes it, while the other often gets unfairly blamed simply all because it shares the same first three letters.
So let’s separate fact from foam.
What is the Difference Between SLS and SLSa?
Although they sound similar, SLS and SLSa are different surfactants (the ingredients that create foam and lift away dirt and oil).
SLS | SLSa |
Sodium Lauryl Sulfate | Sodium Lauryl Sulfoacetate |
Sulfate surfactant | Sulfoacetate surfactant (not a sulfate) |
Smaller molecule | Larger molecule |
Strong cleansing action | Gentle cleansing action |
Can be drying for some skin types | Suitable for sensitive skin formulations |
Common in shampoos and facial cleansers | Popular in bath bombs, bubble baths and natural shampoos |
The important bit?
SLSa is not SLS.
They’re related in name, but not in behaviour.
Think of them as cousins rather than siblings. They might share the family surname, but one turns up to dinner in hiking boots while the other arrives on a motorcycle.
Why is SLSa Considered Gentler?
The reason is surprisingly simple.
SLSa has a larger molecular structure, making it less likely to penetrate the skin’s outer layers. Instead, it works on the surface, lifting away dirt and excess oil before being rinsed away.
That means you still get:
✔ Rich, luxurious bubbles
✔ Effective cleansing
✔ Less disruption to your skin’s natural moisture barrier
In other words, you get all the fun without your skin sending a strongly worded complaint.
Is SLSa Natural?
This is one of the most common questions we hear.
The short answer is no—but it’s nature-derived.
SLSa is typically produced from coconut and palm-derived fatty acids that are then processed into a mild cleansing ingredient.
No one is squeezing bottles of SLSa directly from coconuts (although that would certainly simplify manufacturing).
Like many modern cosmetic ingredients, it starts with natural raw materials before undergoing processing to make it safe, stable and effective.
Why Does SLS Have Such a Bad Reputation?
Poor SLS has become the internet’s favourite skincare villain.
The reality is much less dramatic.
SLS is an excellent cleanser. In fact, it’s too good at its job for some people. It removes oil very effectively, which can leave dry or sensitive skin feeling tight after repeated use.
For oily skin or occasional deep cleansing, many people use products containing SLS without any issues at all.
It’s not “bad.”
It’s simply stronger.
Why Do So Many People Confuse SLS and SLSa?
Blame the alphabet.
Most people read SLSa and stop after the first three letters.
It’s a little like assuming every “Mac” in Scotland belongs to the same family.
Close enough to cause confusion—but not close enough to be correct.
Which Surfactant Should You Choose?
Choose SLS if:
You prefer a powerful cleanse.
Your skin or hair tends to be oily.
You know your skin tolerates stronger cleansers.
Choose SLSa if:
You have sensitive skin.
Your skin is dry or easily irritated.
You’re making natural skincare products.
You want lots of bubbles without feeling stripped afterwards.
For many natural formulators—including us—SLSa offers an excellent balance of cleansing power and skin friendliness.
The Bottom Line
Despite what social media sometimes suggests, SLS isn’t the villain, and SLSa isn’t pretending to be something it’s not.
They’re simply two different surfactants designed for different jobs.
If SLS is the pressure washer, then SLSa is the garden hose with a gentle spray attachment.
Both clean beautifully.
One is just a little kinder to the flowers.
And when it comes to skincare, sometimes that’s exactly what you want.
Disclaimer:
The information shared in this blog is intended for general information and entertainment purposes only and represents our opinions, experiences and interpretations, based on our own research, publicly available information and, where applicable, AI-assisted research and content development. It should not be taken as medical, legal or professional advice, nor as established medical or scientific fact. Always do your own research and consult a suitably qualified professional where appropriate.
In other words, we’re sharing what we’ve found and what we think — not handing down the Ten Commandments of Health.
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