Carcinogen Free 1,4-Dioxane/Ethylene Oxide Tested by an Independent Laboratory Hypoallergenic Certified Ecologo CO2 Neutral Vegan Product EcoFriendly The EcoLogo certification is proof of our environmental leadership. 1,4-dioxane and ethylene oxide may be found as legally tolerated contaminants in personal care products. This Attitude product does not contain these by-products listed as carcinogenic to humans by the International Agency for Research on Cancer (group 1 or 2).