Sodium Lauryl Sulfate
Reviewed by Emma · Last updated 18 Aug 2026
Also known as: Sodium Laureth Sulfate
Versatile ingredient composed of several non-volatile alcohols
EWG Safety Score
What Is Sodium Lauryl Sulfate?
Versatile ingredient composed of several non-volatile alcohols. Functions primarily as a surfactant, but can also be used as a skin-conditioning agent, emulsifier, and solvent. Sodium lauryl sulfate (SLS) is one of the most sensitizing cleansing agents used in skincare products. In fact, it’s considered a standard comparison substance for measuring the skin sensitization of other ingredients. In fact, in scientific studies, when the researchers want to establish whether or not an ingredient is problematic for skin, they compare its effect to that of SLS.In amounts of 2% to 5%, sodium lauryl sulfate can cause sensitizing reactions for many people. Despite the sensitivity issue, it is not the same as the dire and erroneous warnings floating around the web about this ingredient, all of which have been debunked. Sodium lauryl sulfate isn’t a great ingredient in terms of its impact on skin, but its effects are not detrimental to one’s health.
Clinical Evidence & References
Published Research
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Journal of Clinical & Experimental Dermatology Research, November 2014, ePublication [URL]
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British Journal of Dermatology, July 2014, pages 115-123 [URL]
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International Journal of Toxicology, July 2010, pages S151-S161 [URL]
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Contact Dermatitis, January 2003, pages 26-32 [URL]
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European Journal of Dermatology, September-October 2001, pages 416-419 [URL]
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American Journal of Contact Dermatitis, May 2001, pages 28-32 [URL]
From the Clinic
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