For your skin
A UVA filter best known as Mexoryl SX. It adds protection against the wavelengths associated with photosensitivity, pigmentation, and photoaging, but it works as one member of a broader filter blend.
Want the science? Keep reading ↓Mechanism of action
A water-soluble organic UVA filter, with strongest absorption in the shorter and middle UVA range. It is paired with complementary UVA and UVB filters to create broad-spectrum protection.
Why we tier this moderate
2 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
DeLeo VA et al. A new ecamsule-containing SPF 40 sunscreen cream for the prevention of polymorphous light eruption: a double-blind, randomized, controlled study in maximized outdoor conditions. Cutis. 2009;83(2):95-103.
Fourtanier A, Moyal D, Seite S. Sunscreens containing the broad-spectrum UVA absorber, Mexoryl SX, prevent the cutaneous detrimental effects of UV exposure: a review of clinical study results. Photodermatology, Photoimmunology & Photomedicine. 2008;24(4):164-174.
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.