Di
Diethylhexyl Syringylidenemalonate
Diethylhexyl Syringylidenemalonate
A sunscreen helper that keeps filters like avobenzone from breaking down in sunlight. The evidence for it comes from lab tests.
What it does
It helps the SPF hold up in the hours after you apply. It isn’t a UV filter itself, and it isn’t on the US or EU lists of sunscreen filters: the SPF comes from the filters on the label.
Also known as
DESM, Oxynex ST Liquid
Browse all 1238 ingredients — grouped by what they do, each with whatever evidence we can cite.
This page is public so a shared ingredient card always has its sources behind it — and so you can check them without an account.
Want more like this?
Every evidence-based flag cites its source, Drop tells you when your routine is complete, and it helps you simplify — instead of selling you more. The app launches on iOS and Android in October 2026. Rate my routine works today at /rate — no sign-in.