Sodium Lauryl Sulfate (SLS)
A common foaming agent that can cause skin irritation but is not considered a health hazard.
SLS is one of the most common foaming agents in personal care products. While it can irritate sensitive skin, it’s not considered toxic or carcinogenic by regulators.
What is it?
Sodium Lauryl Sulfate is an anionic surfactant — it lowers surface tension to create lather and help remove dirt and oil. It’s derived from coconut or palm kernel oil. Often confused with Sodium Laureth Sulfate (SLES), which is a milder, ethoxylated version.
Where is it found?
Shampoos, toothpaste, body wash, face cleansers, hand soap, and household cleaning products. It’s responsible for the foaming action consumers associate with cleanliness.
EU regulation
SLS has no specific concentration restrictions in EU cosmetics. It is listed in the CosIng database as a permitted surfactant. The SCCS has not flagged safety concerns at levels used in rinse-off products.
Should you worry?
SLS is a known skin irritant at high concentrations or with prolonged contact, which is why it’s used in dermatological testing to induce irritation. However, in rinse-off products at normal concentrations, the risk is minimal for most people. If you have eczema, rosacea, or very sensitive skin, SLS-free products may reduce irritation.
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