Laureth-4
Reviewed by Daisy · Last updated 18 Aug 2026
Also known as: N/A
Works as a cleansing agent in skin care formulas | Also functions as an emulsifier/stabiliser/solubizer and texture enhancer
Addresses
EWG Safety Score
What Is Laureth-4?
Laureth-4 is a form of lauryl alcohol (a non-sensitizing fatty alcohol derived from coconut oil) that can function as a cleansing agent, emulsifier/stabilizer, and formulary texture enhancer. You can find this ingredient in all kinds of skin care products, including cleansers, toners, serums, and other leave-on treatments.
The number 4 correlates to the number of ethylene oxide units attached to the lauryl alcohol, which controls its water solubility. The higher the laureth’s numerical value, the greater the viscosity, eventually leading to white, waxy solids. Laureth-4 is described as a clear, colorless liquid. It can be plant-derived or made synthetically, with both forms producing equivalent results.
Laureth-4 has a proven track record of safety in cosmetics. In 2012, the Cosmetic Ingredient Review Expert Panel reaffirmed its safety status. Despite misinformation found on the Internet, there’s no substantiated evidence that this ingredient is problematic for oily skin.
Clinical Evidence & References
Published Research
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CosmeticsInfo.org, Accessed September 2021, ePublication [https://www.cosmeticsinfo.org/ingredient/laureth-4]
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International Journal of Toxicology, October 2012, pages 169S-244S [https://journals.sagepub.com/doi/10.1177/1091581812460515]
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Colloid Polymer Science, November 2009, pages 423-431 [https://link.springer.com/article/10.1007/s00396-009-0125-2]
Frequently Asked Questions
From the Clinic
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Laureth-12
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Laureth-25
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Laureth-3
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Laureth-5 Carboxylic Acid
A mild surfactant that cleanses and stabilises formulations
Laureth-9
A gentle emulsifier that helps oil and water blend seamlessly in skincare formulations
Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone
Silicone polymer that functions as an emulsifier, cleansing agent, and texture enhancer
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