Never gave supplements a thought. I will continue to take them regardless of impact on BG, so it didn’t matter. I also take therapeutic levels of Vit D, and was popping extra this winter due Covid stories...Friday my blood test came back at 100! OK, time to back off my doctor is happy with 50-100, but I overdid this winter.

I first realized my Vit D levels had finally improved after about nine months on LC/Paleo...switch to natural fats, no processed seed oils like corn or vegetable...but coconut, avocado, lard, etc. and took high levels of Vit D 3 gelcap supplements. Not that prescription Vit D 2..useless.

Good long standing Vit D thread: https://forum.lowcarber.org/showthread.php?t=396439