For your skin
A modern broad-spectrum filter known as Tinosorb M. It adds stable UVA and UVB coverage; because it is particulate, some formulas may show a slight cast depending on filter size and the rest of the base.
Want the science? Keep reading ↓Mechanism of action
A photostable particulate organic filter that both absorbs and scatters ultraviolet radiation across UVB and UVA wavelengths. Its broad spectral coverage makes it useful as a backbone filter in multi-filter sunscreens.
Why we tier this moderate
3 cited papers across 2 countries. 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
Serpone N. Sunscreens and their usefulness: have we made any progress in the last two decades? Photochemical & Photobiological Sciences. 2021;20(2):189-244 — review of sunscreen-filter photochemistry, spectral coverage, stability, and formulation.
Liuti F, Borrego L. Contact dermatitis caused by Tinosorb M: the importance of patch testing with pure methylene bis-benzotriazolyl tetramethylbutylphenol. Contact Dermatitis. 2015;73(3):192-193.
Herzog B et al. In vivo and in vitro assessment of UVA protection by sunscreen formulations containing either butyl methoxy dibenzoyl methane, methylene bis-benzotriazolyl tetramethylbutylphenol, or microfine ZnO. International Journal of Cosmetic Science. 2002;24(3):170-185.
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.