As for sunscreen, I'm not sure I've seen great evidence that any of the ingredients in most products actually harm humans. Those products go through rigorous testing and based on the information we have now, they are not killing us. Of course we could find proof otherwise in the future and that is when some of those ingredients would get reviewed and likely banned. So for the folks that want to use a natural product in order to play it safe in case there are things we don't yet know, then that is fine too.
There are levels of consumption in every product in the world that become toxic to humans, but sunscreen and most things we consume contain like 0.0001% of the levels that would be toxic to humans (even water is toxic at a certain point.. and yes water is a chemical too.. everything is a "chemical", it doesn't have to mean bad). Unless I'm missing something? Is there an ingredient in there that is toxic to humans at the levels contained in sunscreen?
That is the biggest issue with a lot of these fear monger people. They take a study that shows ingredient X is toxic, then determine that product Y is bad for you and you should stop eating or using it. But they don't look at how much you need to consume for it to be toxic vs how much is in the product you are consuming.