Cited skincare — every flag names its source, no upsell.
Ti

Tinosorb M

Methylene Bis-Benzotriazolyl TetramethylbutylphenolSPF filter

Hybrid UV filter (organic + microfine particle). Excellent broad-spectrum coverage; not US-approved.

What it does

Tinosorb M is a hybrid filter — it absorbs UV like a chemical filter and also scatters UV like a mineral filter, depending on particle size. It provides broad UVB and UVA coverage with strong photostability. Common in EU, AU, and JP sunscreens. Not yet approved in the US, which is why import-imported European sunscreens often outperform US formulas on UVA testing.

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

bisoctrizole, methylene bis-benzotriazolyl tetramethylbutylphenol

Pairs worth knowing

Bemotrizinol · works together ↗Avobenzone · works together ↗Iron Oxides · works together ↗

Read more

Reading the evidence · 5 minSunscreen for Aging Concerns: The Most Evidence-Backed Step in SkincareIf one skincare claim has the strongest evidence behind it, it's daily sunscreen for aging-related skin concerns. Here is what the research actually shows.

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