Cited skincare — every flag names its source, no upsell.Ti
Tinosorb M
Methylene Bis-Benzotriazolyl TetramethylbutylphenolSPF filter
A filter that both absorbs and scatters UV, covering UVA and UVB. Common in EU sunscreens, not yet approved in the US.
What it does
It works partly like a chemical filter, absorbing UV, and partly like a mineral one, scattering it. It covers both UVA and UVB and holds up in sunlight. It’s common in EU, Australian and Japanese sunscreens but not yet approved in the US.
The EU’s ingredient database lists it as a UV filter (filters UV rays) and a light stabilizer (protects the product from light).European Commission, CosIng (© European Union, CC BY 4.0) · uses put in plain words by Drop ↗
The evidence, graded
expert consensusSunscreen is the final leave-on step of the morning. The SPF number on the bottle comes from testing that product on its own, spread evenly at 2 mg/cm², with nothing layered over it — so once something goes on top, the label no longer describes what is on the skin. No study Drop has read measured how much protection a layer on top costs.Petersen 2014 · Photodermatology, Photoimmunology & Photomedicine ↗ expert consensusReapply sunscreen at least every two hours during sun exposure, and immediately after swimming, sweating, or towel-drying. One of the reviews behind this advises going sooner: Petersen and Wulf suggest a second coat within the first hour, because the first coat is almost always thinner than the amount the SPF number was measured on.Petersen 2014 · Photodermatology, Photoimmunology & Photomedicine ↗ expert consensusIn 1999 the SCCNFP was of the opinion that bisoctrizole is safe for use in cosmetic products as a UV light absorber at a maximum of 10%. In 2015 the SCCS (SCCS/1546/15) concluded that its nano form, at up to 10% in products applied to skin, is considered not to pose a risk after application on healthy, intact skin. Given severe inflammatory effects of the microfine form in the airways, the opinion does not apply to uses that could expose the lungs.SCCNFP 1999 · European Commission SCCNFP (adopted at the plenary session of 17 February 1999) ↗ Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.
Also known as
bisoctrizole
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