How Bemotrizinol Compares to the Filters You Already Use
Old US lineup vs the new addition.
Bemotrizinol is the first new active added to the US OTC sunscreen monograph since the late 1990s, approved at up to 6% in June 2026.
Cosmetic chemists describe bemotrizinol as broad-spectrum and so photostable that it retains the large majority of its activity even after intense UV exposure, unlike older filters that fade.
Questions we get a lot
What does broad-spectrum protection actually mean?
'Broad-spectrum' means a sunscreen protects against both UVA and UVB. In the US a product must pass an FDA critical-wavelength test to make the claim. Because SPF only measures UVB protection, broad-spectrum labeling is how you know you're also covered against deeper, aging UVA rays.
Why are some UV filters more photostable?
A photostable filter keeps absorbing UV without breaking down in sunlight. Older filters like avobenzone can lose protection within an hour unless paired with stabilizers such as octocrylene. Bemotrizinol is engineered to stay chemically stable, so protection lasts longer — though reapplication is still advised.
How does bemotrizinol compare to avobenzone and zinc oxide?
Avobenzone covers UVA well but degrades in sunlight unless stabilized; zinc oxide is gentle and photostable but can leave a white cast. Bemotrizinol is broad-spectrum across UVA and UVB and highly photostable on its own, which is why it can complement or upgrade the filters already in US sunscreens.
r/SkincareAddiction: 'How does bemotrizinol stack up against the avobenzone and zinc I already use?'