Sodium Laureth Sulfate
Reviewed by Emma · Last updated 18 Aug 2026
Also known as: SLES
Cleansing agent that produces a foaming/lathering effect | Commonly found in facial cleansers, body washes, and shampoos
EWG Safety Score
What Is Sodium Laureth Sulfate?
Sodium laureth sulfate (commonly referred to by its acronym, SLES) is a commonly used cleansing agent that can be derived from coconut or produced synthetically, although even the coconut-derived source is processed to the point where it is no longer considered natural. It is known for producing a foaming/lathering effect and is considered gentle in normal cosmetic use (typically in face/body cleansers and shampoos).
In the late 1990s an e-mail hoax surfaced claiming that sodium laureth sulfate was a dangerous ingredient. This allegation has been dispelled by numerous industry experts/organizations. For decades, the Cosmetic Ingredient Review has officially deemed sodium laureth sulfate as safe, with the latest reported use studied in up to a 50% concentration.
Despite the name similarity, sodium laureth sulfate is NOT the same as sodium lauryl sulfate, which can indeed be irritating to skin. Sodium laureth sulfate is a milder on skin due its different chemical structure.
As a raw material, sodium laureth sulfate appears as a slightly hazy or clear solution.
Clinical Evidence & References
Published Research
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CosmeticsInfo.org, Accessed April 2021, ePublication [https://www.cosmeticsinfo.org/ingredient/sodium-laureth-sulfate/]
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International Journal of Toxicology, July 2019, pages 151S-161S [https://journals.sagepub.com/doi/10.1177/1091581810373151]
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American Chemical Society, October 2017, ePublication [https://www.acs.org/molecule-of-the-week/archive/s/sodium-laureth-sulfate.html]
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Contact Dermatitis, January 2003, issue 1, pages 26-32 [https://onlinelibrary.wiley.com/doi/abs/10.1034/j.1600-0536.2003.480105.x]
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Food and Chemical Toxicology, March 2001, pages 279-286 [https://www.sciencedirect.com/science/article/pii/S0278691500001320]
From the Clinic
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