Super sunscreen.

It means chemical sunscreens can irritate the skin and they may become less effective as the molecules are absorbed. Alongside them, chemical sunscreens also often include molecules called antioxidants that can neutralise free radicals that damage the skin. The other thing is that these studies don't mimic how sunscreens spread from skin to reef water and onto corals, and they use massively higher concentrations of sunscreen ingredients than have ever been measured on an actual reef. [Extracted from the article]