Cited skincare — every flag names its source, no upsell.Me
Mexoryl XL
Drometrizole TrisiloxaneSPF filter
A filter covering UVA and UVB that holds up in sunlight and steadies avobenzone. Common in EU sunscreens, not approved in the US.
What it does
It covers UVB and a good share of UVA, holds up in sunlight and helps keep avobenzone stable. It’s common in pricier EU sunscreens. It isn’t approved in the US, which is why some sunscreens sold under the same name differ between the US and the EU.
The EU’s ingredient database lists it as a UV filter (filters UV rays) and a light stabilizer (protects the product from light).European Commission, CosIng (© European Union, CC BY 4.0) · uses put in plain words by Drop ↗
The evidence, graded
expert consensusSunscreen is the final leave-on step of the morning. The SPF number on the bottle comes from testing that product on its own, spread evenly at 2 mg/cm², with nothing layered over it — so once something goes on top, the label no longer describes what is on the skin. No study Drop has read measured how much protection a layer on top costs.Petersen 2014 · Photodermatology, Photoimmunology & Photomedicine ↗ expert consensusReapply sunscreen at least every two hours during sun exposure, and immediately after swimming, sweating, or towel-drying. One of the reviews behind this advises going sooner: Petersen and Wulf suggest a second coat within the first hour, because the first coat is almost always thinner than the amount the SPF number was measured on.Petersen 2014 · Photodermatology, Photoimmunology & Photomedicine ↗ Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.
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.