Finding a good organic sunscreen is no easy task. The best ones from an ingredient standpoint can be compromised in texture (as in: is that toothpaste or suntan lotion?) and/or scent. But it's important to find a sunblock that's chemical-free and devoid of endocrine disruptors like oxybenzone, which can wreak havoc on your hormone levels. Many brands have recently drawn attention to nanoparticles as another concern, but the EWG (Environmental Working Group, a non-profit watchdog organization that ranks products on their toxicity for humans and the environment) has stated that "non-nano" sunscreen is actually a misnomer, as more research is needed to make a definitive set of guidelines for nanoparticles. Both zinc oxide and titanium dioxide—the two most effective physical blockers according to the EWG—are nanoparticles; it's the size of the particles that matters, and that's tough for brands to gauge and therefore market accurately.
All that said, innovation in the green sun protection space means there are more organic sunscreen options available now than ever before. This definitive list is based on a combination of a few important credentials: organic ingredients, consistency, ease of use, EWG safety rating, ingredient list, and of course, scent.