SLS (Sodium Lauryl Sulfate) is a synthetic cleansing agent that lathers strongly but can dry out the skin. Alternatives like saponified plant oils cleanse more gently without damaging the skin barrier.
What is SLS?
SLS stands for Sodium Lauryl Sulfate. It is a synthetic cleansing agent (surfactant) widely used in shower gels, shampoos, toothpaste and household cleaners. Its popularity comes from its strong foaming effect and low cost.
On INCI lists, SLS appears as "Sodium Lauryl Sulfate". Related substances are SLES (Sodium Laureth Sulfate), ALS (Ammonium Lauryl Sulfate) and ALES (Ammonium Laureth Sulfate).
What does SLS do?
SLS is a surface-active substance that removes fat and dirt from the skin. It works by lowering the surface tension of water, allowing water to mix with oil. This makes it an effective cleansing agent.
The downside: SLS doesn't distinguish between dirt and the natural oils that protect your skin. It removes both, which can damage the skin barrier.
Possible effects on the skin
SLS is approved for cosmetic use (EU and FDA), but can cause problems for some people:
- —Dehydration by removing natural oils
- —Irritation with prolonged contact or high concentrations
- —Worsening of existing skin conditions (eczema)
- —Sensitivity with a compromised skin barrier
SLS vs. SLES: what's the difference?
| Property | SLS | SLES |
|---|---|---|
| Full name | Sodium Lauryl Sulfate | Sodium Laureth Sulfate |
| Irritation potential | Higher | Lower (ethoxylated) |
| Lather formation | Strong | Strong |
| Common in | Toothpaste, industrial products | Shower gels, shampoos |
SLES is somewhat milder than SLS because it has undergone an ethoxylation process. Both are, however, sulphate-based cleansing agents.
Alternatives to SLS
Saponified oils
Coconut and olive oil saponified into a mild cleanser containing glycerine.
Mild surfactants
Cocamidopropyl Betaine and Sodium Cocoyl Isethionate are gentler than sulphates.
Glucoside-based
Coco-Glucoside, derived from sugar and coconut oil.
Our choice
We use no SLS, SLES, ALS or other sulphate cleansing agents. Our body bars cleanse with saponified plant oils. a traditional method that gently cleanses and cares for the skin.
This choice is on our NO-list: a published list of ingredients that we never use under any circumstances.
Last updated: 2026-02-03