A Sense of Soap: Behind the Lather

Ever wondered what makes your soap or shampoo foam up? That rich, satisfying lather comes from surfactants—ingredients that help cleanse away dirt and oil. Two of the most common are Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES), and while they may sound similar, they work a little differently.

SLS vs. SLES: What’s the Difference?

SLS is a powerful cleanser, known for creating a thick lather. But for some skin types, it can be too strong, stripping away natural oils and causing dryness or irritation.

SLES, on the other hand, goes through an extra process called ethoxylation, which makes it gentler and less likely to disrupt the skin barrier. It still cleans effectively but with a milder touch—one reason why many brands opt for SLES over SLS.

How Do They Impact the Environment?

Both SLS and SLES are biodegradable, breaking down over time in water systems. However, SLS takes longer to degrade, meaning it can linger in aquatic environments and pose a higher risk to marine life.

SLES is considered the milder option, but it comes with its own challenges. Its production requires careful refinement to remove potential contaminants like 1,4-dioxane, a byproduct that needs to be properly filtered out to ensure safety. Responsible brands take extra steps to purify their SLES and meet strict safety standards.

Why Some Brands Choose SLES

For a balance between effectiveness and gentleness, SLES is often the better choice. It provides the cleansing power needed for a satisfying lather, while being less harsh on the skin and the environment. That’s why some shampoos—including Earthoskin’s—are carefully formulated with SLES, ensuring a skin-friendly wash without the drawbacks of SLS.

What to Look For in a Cleanser

If you prefer a sulfate-free alternative, look for ingredients like coco-glucoside or sodium cocoyl isethionate—both known for their gentle cleansing properties.

But if you see SLES on a label, it’s often there for a reason—to provide a balanced, effective cleanse while minimizing unnecessary irritation. Thoughtful formulation makes all the difference, both for your skin and the planet.