Reef-safe sunscreen is worth the extra search.

It matters, but the term “reef-safe” is unregulated marketing. The real issue is two chemicals: oxybenzone and octinoxate. Studies show they bleach coral and mess with fish hormones. Some places (Hawaii, Key West, Palau) have straight-up banned them.

The fix is simple: buy sunscreens with zinc oxide or titanium dioxide as the active ingredient. Those are mineral-based, sit on top of your skin, and don’t wash off into the ocean as endocrine disruptors. Non-nano zinc oxide is the gold standard — the particles are big enough that fish don’t ingest them.

Does your single tube of sunscreen save the Great Barrier Reef? Probably not. A lot of reef damage comes from warming water and agricultural runoff. But sunscreens are easy to swap. If you’re already buying sunscreen, grab a mineral one. It’s cheap insurance.

Your skin still needs protection. Don’t ditch sunscreen because of coral guilt.