I find Nutrition Detective to be very high signal when it comes to things like this. He talks about sunscreen some specifically, but his approach to things like this is more general. I tried to do a YouTube search to find one about sunscreen for you, but I couldn’t find one quickly. It makes the most sense to ask more fundamental questions like: is whatever I put in or on my body beneficial or harmful? What harms my body? I’d say poisons/toxins. What is beneficial for my body? I’d say nutrients. Then I’d ask, what do sunscreens consist of, nutrients or poisons? Do I even actually know what is a poison or a nutrient? I was extremely surprised to find out that some things I thought were nutrients are actually toxins. These truths were even more surprising considering that healthcare has been my profession for a very long time