Polysilicone-15 (Parsol SLX)
A silicone-based 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
Polysilicone-15 (Parsol SLX) 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 peer-reviewed study of polysilicone-15 in corals, reef fish or other marine organisms turned up in PubMed, and a search pairing its names with coral, reef, marine and aquatic terms returned no records. PubMed returns four records for its names: two skin-allergy reports (Suzuki et al. 2022; Sarre et al. 2014), an in vitro sun-protection study (Couteau et al. 2007) and a LactMed entry on sunscreens and breastfeeding. The Couteau study measured SPF in a lab, not effects on marine life.
- PubMed E-utilities search: polysilicone-15, Parsol SLX or polysilicone 15 in title/abstract
- PubMed E-utilities search: Parsol SLX or polysilicone-15 with coral, reef, marine or aquatic
- PubMed records 41730063, 35306675, 24450826, 17663193 (E-utilities efetch)
Products that contain it (1)
Search these products that list polysilicone-15 →
Related ingredients: Oxybenzone, Homosalate
Last reviewed October 14, 2026.