When applied to animal skin in lab tests, that gel was found to block harmful ultraviolet rays as effectively as a conventional mineral- or chemical-based sunscreen with an SPF rating of about 30. This means it blocked approximately 97% of the UV rays. And importantly, the gel had no effect on corals after being added to the water in which they were living, even after 60 days. By contrast, the corals died of bleaching within six days of exposure to commercial sunscreens. https://newatlas.com/environment/plant-pollen-coral-friendly-sunscreen/
