BHT
Reviewed by Rosie · Last updated 18 Aug 2026
The abbreviation for butylated hydroxytoluene
EWG Safety Score
What Is BHT?
BHT is butylated hydroxytoluene, a potent synthetic antioxidant sometimes used to help stabilize light- and air-sensitive cosmetic ingredients such as retinol and unsaturated fatty acids. BHT is also globally approved for use as a food-grade preservative, where its antioxidant action keeps foods fresher longer. Amounts of 0.02% or less are considered safe for this use; however, controversial reports have been published since the 1970s that digestive metabolites of BHT could cause health problems.
The amount of BHT uses in cosmetic products is typically 0.0002%-0.5%. Such low amounts do not pose a risk to skin (indeed, the safety assessment found BHT was non-irritating) nor does it penetrate skin far enough to be absorbed into the bloodstream. The European Union's Scientific Committee on Consumer Safety concluded in December 2021 that "BHT is safe as an ingredient up to a maximum concentration of 0.8% in other leave-on and rinse-off products."
Benefits for Your Skin
Clinical Evidence & References
Published Research
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Environmental Science and Technology, October 2020, pages 11,706–11,719 Environmental Science and Technology, 2020
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Environment International, July 2019, pages 24–29 Environment International, 2019
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International Journal of Toxicology, Volume 21, Issue 2, October 2002, pages 19–94 International Journal of Toxicology, 2002
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