What it is
Iscotrizinol is a triazine-class organic sunscreen agent that strongly absorbs UVB radiation. It is a large, oil-soluble molecule with high photostability, which makes it useful for building high-SPF formulas and supporting the stability of other filters.
Spectrum coverage
UVB
Regional approval · max %
JP ✓ 10% Japan: Approved · Max 10% KR ✓ 10% South Korea: Approved · Max 10% EU ✓ 10% Europe: Approved · Max 10% US · — United States: Pending
Safety & warnings
It is a large molecule with low skin penetration and is generally regarded as well tolerated.
Reef-toxic
No
Endocrine disruptor
No
Comedogenicity
0
Origin & sourcing
Synthetic organic UV filter; not found in nature.
Questions everyone asks
What kind of UV does iscotrizinol block?
It mainly absorbs UVB, so it is usually paired with separate UVA filters for broad-spectrum coverage.
Is it photostable?
Yes, it is valued for being photostable and helping high-SPF formulas hold up in sunlight.