Uvb?

Does anyone use uvb on their indoor enclosures? My boxie is burrowed so much Time that I think it would be a waste. I take her outside once in a while to get natural sunlight. I do supplement with calcium with vitamin d once a weekish. I kept my boxie indoors for this summer. She didn’t seem to do great outside last year. And it feels like this is the first year my turtle has been out more and more social. Still small and not gaining much weight. But eating more than she ever has this year. Thanks!

How often outdoors is"some times"?
The answer to that will determine if you need supplemental UV.
Boxies are generally shade dwelling. But yours might still benefit by getting some indirect sun or a substitute.
Not getting enough UV won't manifest itself at once. The animal will get ill over a period of time.

Usually once a week outdoors. Had her outside the whole summer last year and she bromates from about October til April, even with my attempts to keep her awake all year round, she still just does her thing and hides and doesn’t eat for six months. A few days ago I started experimenting with uvb for one of my crested geckos who aren’t supposed to need uvb. I guess I just wonder how beneficial artificial light is? And if taking my boxie out once a week is better than artificial? I’ve had her for about little over two years and I feel like I finally have her in a good routine. Ok thanks. Sorry for the rambling

If the artificial source operated perfectly all of the time then it would be just as good. But UV lamps need to be replaced every 6 months. They also don't all distribute UV very well. Some hurt animals eyes, etc..
So, yes.
Sunlight is always best in my opinion.
Is it once a week for a few hours?

For about 30 minutes.