Thanks for asking, because "reef safe" can be a misleading claim. What manufacturers generally mean by "reef safe" is that they simply don't contain compounds like oxybenzone, etc. It is now proven that these chemicals damage fragile reef habitats. The problem that I have is that I consistently see sunscreen claiming to be "reef safe", yet are full of other ingredients (Nano zinc and titanium, alumina , etc.) that are known to be toxic to the base of the ocean food chain. It is a complex issue and one that we take very seriously. We don't have all the answers, so we need to be very careful, with both what we claim and what we do. Our claim is that Avasol is "safe for the ocean". Our ingredients are 100% bio-based and are the safest that we can find for the ocean and other aquatic habitats. We have also made a tremendous effort to create bio-based and plastic free packaging with the introduction of our stick product. It is a huge challenge, but we will be continually working towards improving the sustainability and earth-friendliness of all our other packaging as well. The bottom line is that if you can find a more reef and ocean safe product, please let us know!