Sunscreen filters
Bemotrizinol
Also listed as bis-ethylhexyloxyphenol methoxyphenyl triazine, BEMT, Tinosorb S
A photostable broad-spectrum filter used outside the US for 25 years. In June 2026 it became the first new US sunscreen active in about two decades (up to 6%).
What it is
Bemotrizinol absorbs across UVB and UVA (peaks near 310 and 340 nm), is very stable in sunlight, and stabilises avobenzone when the two are combined. It is a large, oil-soluble molecule (about 630 daltons), which limits how much passes through skin.
It has been allowed in the EU (up to 10%), Australia and Asia since around 2000. In June 2026 the FDA issued a final order adding it to the US sunscreen monograph at up to 6% for adults and children aged 6 months and older, the first addition since the late 1990s.
How strong is the evidence?
Strong evidenceIts broad-spectrum absorption and photostability are well documented in formulation testing, and FDA's 2026 review found it safe and effective with low absorption through skin. Long-term clinical outcome trials exist for sunscreens in general, not for this filter specifically.
What it's used for, checked
Broad-spectrum UVB + UVA protection
Holds upOne of the most efficient broad-spectrum filters available.
Stabilises avobenzone
Holds upKeeps avobenzone-containing formulas working through sun exposure.
Low absorption into the body
Holds upFDA's review found low skin absorption, consistent with its large molecular size.
Works well with
- avobenzone
- bisoctrizole
- diethylamino-hydroxybenzoyl-hexyl-benzoate
Who should be careful
- Allergy appears rare.
- US approval covers adults and children 6 months and older; for younger babies, shade and clothing first.