Marine Sanctuaries are home to some of the ocean’s most biologically diverse and culturally significant marine areas, and we need to ensure that these critical areas are protected from harmful chemicals, in addition to other damaging practices like oil and gas extraction
To keep ocean life happy, the key is to find an SPF that uses physical UVA and UVB filters (as opposed to the chemical ones that have been connected to coral reef deterioration). You’ll be able to find them by flipping the SPF tube over and looking for the active ingredients: zinc oxide and titanium dioxide. These ingredients form an actual physical block to shield skin from absorbing any rays (whereas chemical filters absorb UV and turn it into heat that’s released from skin).
“The term reef safe typically means that the sunscreen contains only mineral UV-blocking ingredients like oxide and titanium dioxide,” explains Joshua Zeichner, a board-certified dermatologist in New York City. “Both nano particle—a smaller particle size—and traditional zinc oxide sunscreens are both safe and effective, and both will be considered safe for reefs. The only difference is the cosmetic feel on the skin.” So you’re pretty much good to go with a mineral-based option.
savethereef.org