Can vitamins prevent constipation

I don't know for sure, but I just started taking vitamin d tablets (one 400IU tablet daily, along with my multi-vit that contains another 400IU), and it seems that I've had more constipation than normal lately. I think it began right when I started taking the additional d supplement.

Yes, it does! I have started taking calcium and vitamin D and they both cause constipation for me. I have read that taking magnesium with calcium and vitamin D may help, so I am gonna try that. If it doesn't help, I may have to stop taking my supplements....I can't stand the constipation!!