Ah interesting, I suspected there might be some differences, unfortunate that the US hasn't made any regulation around that.

Given the context of this post being a sunscreen scandal, do you know how UVA is tested? Someone earlier was saying that sunscreen is tested on humans and you see how long it takes to get burned, if that's the case and UVA doesn't burn you, I'd be curious how these UVA filtering claims are validated.

Even among sunscreens that do a decent job filtering UVA the points in this article are still relevant: https://www.ewg.org/sunscreen/report/whats-wrong-with-high-s...

Basically high SPF allows behavior thats somewhat unnatural. Someone with SPF 15 might get a tiny bit sun sensitive after a few hours and go back inside, where someone with SPF 50+ keeps going all day long and that might not be healthy.