For your skin
Another new-generation UVB filter used to top up sun protection in modern sunscreens. It is oil-loving, stays on the surface rather than sinking in, and does not degrade in sunlight, so it contributes reliable, all-day UVB coverage as part of the multi-filter blends common in Korean and European formulas.
Want the science? Keep reading ↓Mechanism of action
A largely-UVB organic filter (peak ~310 nm, with some short-UVA absorption) that is very oil-soluble and photostable. Its large molecular size keeps it on the skin surface with minimal penetration. Used as a UVB booster in modern broad-spectrum systems, often alongside DHHB and the Tinosorb filters. EU/Asia approved; not FDA-approved.
Why we tier this moderate
1 cited paper across 1 country. The mechanism is well-described and there's at least one controlled trial in the literature, but we tier this Moderate rather than Strong to stay honest about how many specific papers we cite directly.
Cited research
Osterwalder U, Sohn M, Herzog B, Global state of sunscreens, Photodermatology, Photoimmunology & Photomedicine 2014;30(2-3):62-80 — comprehensive review of the worldwide UV-filter landscape, including the photostability and spectral coverage of the modern organic filters such as iscotrizinol (Diethylhexyl Butamido Triazone)
Sources: PubMed · KCI · J-Stage · CNKI · Wanfang · SFD · MFDS · Cochrane · SCCS · CIR. Every entry points to a specific document. See methodology for what each outcome label means.