Iscotrizinol (Uvasorb HEB)
A UVB filter used outside the US.
Banned in
- Palau
Also excluded where only mineral sunscreen is allowed
- Maui County
- Hawaiʻi County
Not approved in the US, so US sunscreens do not contain it.
Where it’s restricted
Named in the law or guidance
| Location | Status | Since |
|---|---|---|
| Palau law text ↗ | In force | January 1, 2020 |
Also not allowed under mineral-only rules
Iscotrizinol (Uvasorb HEB) isn’t named in these laws, but they allow only mineral (zinc oxide or titanium dioxide) sunscreens, so a product containing it is excluded anyway.
- Maui County (Maui, Molokaʻi, Lānaʻi) (in force since October 1, 2022)
- Hawaiʻi County (Big Island) (in force since December 1, 2022)
What the reef research says
No coral toxicity study was found. In a 2020 study, iscotrizinol (DBT) had no effect on the marine microalga Tetraselmis sp. or the brine shrimp Artemia salina, even at 2 mg/L. A 2026 study found that DBT caused less than 10% growth inhibition in Chlorella vulgaris when tested alone at up to 15 mg/L, and that triazine filters including DBT were markedly less toxic to Daphnia magna than three non-triazine filters. A 2026 chronic test on Chlorella found no statistically significant effect from the triazine filters, and the authors suggest the exposure regimes were inadequate to show measurable effects. In 2022, DBT averaged 34 ng/g dry weight in suspended particulate matter from German waters, and its concentration rose at all monitored Rhine stations from 2005 to 2022.
Sources (4)
- Toxics 2020: Effect of 10 UV Filters on the Brine Shrimp Artemia salina and the Marine Microalga Tetraselmis sp. (PubMed record)
- Ecotoxicology and Environmental Safety 2026: Acute toxicity of novel triazine-based UV filters towards Chlorella vulgaris and Daphnia magna (PubMed record)
- Bioresource Technology 2026: Chronic toxicity of triazine-based and non-triazine UV filters toward Chlorella vulgaris (PubMed record)
- Environmental Pollution 2026: Long-term trends and patterns of legacy and emerging cosmetic UV filters in German waters (PubMed record)
What to look for instead
Related ingredients: Ethylhexyl Triazone (Uvinul T 150), Bemotrizinol (Tinosorb S), DHHB (Uvinul A Plus)
Last reviewed October 14, 2026.