Tinosorb M
Also known as: Methylene Bis-Benzotriazolyl Tetramethylbutylphenol, MBBT, Bisoctrizole
The hybrid filter that behaves like both a mineral and a chemical — and one of the reasons your favorite Korean or French sunscreen leaves such a clean finish.
What It Does
Deep Dive
Tinosorb M is a microfine particle filter that both absorbs UV (like a chemical filter) and reflects/scatters it (like a mineral filter). The result is exceptional broad-spectrum protection across UVA + UVB with near-zero whitecast and almost no skin penetration. It's highly photostable and pairs perfectly with Tinosorb S, covering the full UV range without the degradation issues of the avobenzone + octocrylene American duo. Why don't you have it in your US sunscreen? Because the FDA's OTC sunscreen monograph has been frozen since 1999 — Tinosorb M (approved in the EU in 2000, in 80+ countries since) has never made it through the FDA pipeline. This is the single biggest reason to buy EU/Asian/Australian sunscreens.
