✅ Zinc oxide and/or Titanium dioxide sunscreens are mineral sunscreens. These physically block the sun’s rays and have not been shown harmful to the reefs. They are biodegradable and hypo-allergenic. ✅ “Non-nano” refers to particles larger than 100 nanometers and is considered safe for us and the reef.

Physical sunscreens (also known as mineral or inorganic sunblocks): Products that use zinc oxide and titanium dioxide and are considered “safe” for use around coral reefs.* There is some new evidence suggesting that titanium dioxide may be safer for corals than zinc oxide. These are the best choice.