What it is
Diethoxyethyl succinate is an ester of succinic acid with ethoxyethanol groups, valued for its light, silky slip and quick absorption. In sunscreens it functions as an emollient and as a solvent that can help dissolve and distribute organic UV filters and other oil-soluble ingredients evenly. It is common in Japanese essence- and gel-type sun care where a watery, non-greasy texture is the goal.
Safety & warnings
This lightweight ester is generally regarded as well tolerated and low in irritation potential at cosmetic use levels.
Origin & sourcing
Synthetic ester produced by reacting succinic acid with ethoxyethanol; succinic acid itself can be obtained by fermentation or petrochemical routes.
Questions everyone asks
Why is it used in sunscreens?
It serves as a light emollient and solvent, helping dissolve oil-soluble UV filters and giving the product a quick-absorbing, non-sticky feel.
Is it oily on the skin?
No, it is prized for a light, fast-spreading texture rather than a heavy or greasy one.