1,4 dioxane: An established carcinogen, this chemical is a byproduct of ethoxylation, a process used on various ingredients in cosmetics and cleaning products—of which sodium laureth sulfate (SLES) is the most notorious. 1,4-dioxane is also an environmental pollutant and is suspected of being harmful to the kidneys, liver, and central nervous system. Skin Deep score: 10
1,4 dioxane
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