For your skin
One of the best sunscreen filters available today: a single ingredient that covers the whole UV range, does not break down in sunlight, and props up less-stable filters. It is the backbone of most modern Korean and European sunscreens and a big reason those formulas feel lighter and protect more reliably than older US chemical ones. Its main limitation is regulatory, not performance: the FDA has not approved it yet.
Want the science? Keep reading ↓Mechanism of action
A modern broad-spectrum organic filter absorbing across UVB and UVA (280-400 nm) with two peaks (~310 and ~340 nm). It is highly photostable, itself photostabilises avobenzone and octinoxate, and has negligible skin penetration and no meaningful endocrine signal in current data. Approved in the EU, Asia, and Australia (not yet FDA-approved in the US), which is why it anchors most K-beauty and European sunscreens.
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 bemotrizinol (Tinosorb S)
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.