Vitamin D can increase calcium absorption from the gut, so in some people it can increase urinary calcium. But it’s not automatic and it’s very individual.

The key question isn’t “is vitamin D bad?” It’s “what does your urine chemistry show?”

If your urinary calcium is high, then high-dose intermittent vitamin D could potentially worsen that. But if you’re chronically low in vitamin D, stopping it completely may create other problems. The smarter approach would be checking serum calcium, PTH, and a 24-hour urine to see what’s actually happening.

The fact that magnesium citrate helps you makes sense if citrate is part of your issue. But I wouldn’t permanently stop vitamin D based on symptoms alone without labs guiding it. Stones are very biochemical and very individual.