Iirc, there is a bill up that would change that. Which, surprisingly, has bipartisan support.
Edit: yup, even maga support. Mike Lee thanks AOC for bringing up the issue, and here's the bill.
It looks like the best regulations currently for UVA and UVB would be the EU.
One thing to look out for with the imported stuff is that it's not a counterfeit product. There are a lot of reports about that, including a lot of dermatologists testing them live on video and showing some counterfeits being less than 1% of the claimed effectiveness.