Ethoxydiglycol Good Solvent No known benefits Ethoxydiglycol at a glance Solvent that helps improve the penetration of other key ingredients in a skin care formula Popular in self-tanning products due to the way it minimises streaks Found in all kinds of personal care products, including deodorants and hair dyes Also goes by “diethylene glycol monoethyl ether” or the trademark name “Transcutol®” As a raw material it appears as a clear liquid and is water soluble Ethoxydiglycol description Ethoxydiglycol is considered a safe, well-tolerated synthetic solvent that helps improve the function, penetration, and texture of skin care products. It’s particularly popular in sunless tanning products due to the way it facilitates smooth spreading and minimises streaking. It can also be found in numerous other personal care products ranging from skin care serums to hair dyes. When used in skin care products, it is known to help key ingredients absorb more effectively. Ethoxydiglycol also goes by the name diethylene glycol monoethyl ether and is marketed under the trademarked ingredient name Transcutol®. As a raw material it appears as a clear liquid and is water soluble. In 2013, the European Scientific Committee on Consumer Safety concluded that the use of ethoxydiglycol does not pose a risk in leave-on cosmetic formulations at a maximum concentration of 2.6% “taking into account the other uses previously assessed (10% in rinse-off products, 7.0% in oxidative and 5% in non-oxidative hair dye formulation).”