Is
Iscotrizinol
Diethylhexyl Butamido TriazoneSPF filter
Modern UVB filter. Photostable, oil-soluble, used in EU broad-spectrum sunscreens.
What it does
Iscotrizinol is a UVB-absorbing chemical filter with strong photostability. Oil-soluble; integrates well into anhydrous and lipid-rich sunscreen formulations. Approved in EU, AU, and JP; not US. Often co-formulated with bemotrizinol and avobenzone in mid-to-high-end EU sunscreens.
The evidence, graded
expert consensusSunscreen must be the final AM step. Applying products on top of sunscreen disrupts the protective film and can compromise the labeled SPF.Petersen 2014 · Photodermatology, Photoimmunology & Photomedicine ↗
expert consensusSPF protection degrades under UV exposure. Reapply sunscreen every 2 hours during continuous sun exposure to maintain rated protection — and immediately after swimming, sweating, or towel-drying.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.
Also known as
diethylhexyl butamido triazone, uvasorb hbe
Pairs worth knowing
This page is public and indexed on purpose (unlike profiles and drops, which are unlisted) — it’s the citation behind shared ingredient cards, and it should be findable.
Want more like this?
Get Drop, free. Every flag cites its source, the app tells you when your routine is complete, and it helps you simplify — instead of selling you more products.