What it is
Ethoxydiglycol is a clear, low-viscosity liquid that mixes readily with both water and oils, which makes it useful as a coupling solvent in skincare and sunscreen formulas. It helps dissolve poorly soluble actives, fragrances, and some UV filters, and can thin a formula to make it feel lighter on the skin. It is commonly added at low levels to support the even distribution of other ingredients.
Safety & warnings
Ethoxydiglycol is generally well tolerated at the low concentrations used in cosmetics. It is not considered a notable allergen or a comedogenic ingredient. As with most glycol-based solvents, very high levels could contribute to a feeling of dryness, but typical use levels in finished products are low.
Origin & sourcing
Ethoxydiglycol is a synthetic glycol ether produced industrially from ethylene oxide and ethanol chemistry.
Questions everyone asks
What does ethoxydiglycol do in a sunscreen?
It acts as a solvent that helps dissolve and evenly distribute other ingredients, and it can thin the formula so it spreads and feels lighter on the skin.
Is ethoxydiglycol the same as Transcutol?
Transcutol is a trade name for a high-purity grade of ethoxydiglycol, so the two refer to the same chemical.