Octinoxate

Octinoxate is the UVB-absorbing chemical filter that travels with oxybenzone as the pair banned from reefs in Hawaii, Key West, and Palau for harming coral. On the body, it is endocrine-active: Europe's safety committee confirms it has estrogenic and weak anti-androgenic effects in both lab dishes and live animals, and separate animal work points to thyroid disruption. It does pass through skin into the bloodstream, though less readily than oxybenzone. Here the honest balance tilts gentler than its partner: Europe's 2025 review judged it safe at the 10% cap even for children, and the FDA still lists it as an approved filter, so the regulators land on permitted-with-limits rather than the deeper caution they apply to oxybenzone. The reason it still sits at better-to-avoid is the same as for oxybenzone: it is hormonally active and reef-banned, and there is no need to accept either question when mineral filters, zinc oxide and titanium dioxide, do the same job without them.