For your skin
The most widely used chemical UVA filter in Western sunscreens, critical for blocking the longer wavelengths that drive photoaging, pigmentation, and deeper DNA damage. Always look for it paired with a photostabiliser such as octocrylene so it doesn't degrade and leave you unprotected mid-day.
Want the science? Keep reading ↓Mechanism of action
Avobenzone (butyl methoxydibenzoylmethane) absorbs UVA radiation (320–400 nm) via enol-to-keto tautomerism, converting UV photon energy to heat. It provides no meaningful UVB coverage — separate UVB filters are required for broad-spectrum protection. Critically, avobenzone is photounstable: extended UV exposure degrades the molecule and sharply reduces UVA protection unless the formula includes a photostabiliser (typically octocrylene, bemotrizinol, or an antioxidant blend). FDA-approved at up to 3% in OTC sunscreens.
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
Afonso S, Horita K, Sousa e Silva JP, et al. Photodegradation of avobenzone: stabilization effect of antioxidants. J Photochem Photobiol B. 2014;140:36-40.
Wang SQ, Stanfield JW, Osterwalder U. In vitro assessments of UVA protection by popular sunscreens available in the United States. J Am Acad Dermatol. 2008;59(6):934-42.
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.