Many common sunscreens contain chemicals that are highly toxic to coral reefs. The two most widely recognized harmful ingredients are oxybenzone and octinoxate. When these chemicals wash off your skin, they enter the water and can have devastating effects on marine ecosystems, even at very low concentrations.

These chemicals contribute directly to coral bleaching by lowering the temperature at which corals expel their symbiotic algae, leaving them stressed and colorless. They also cause DNA damage, disrupt coral reproduction, and cause deformities in coral larvae.

To protect the delicate reefs of Miami, it is best to choose mineral-based sunscreens. Look for products that list zinc oxide or titanium dioxide as their active ingredients. These ingredients sit on top of the skin and physically block UV rays.