I've heard the possible MS and vitamin D link before, but who knows. When I think back, I took vitamins for almost my entire life, as well as going out in the sun a lot (I live in So. CA), so I definately got my share of vitamin D. I think they're grasping at straws and trying their best to come up with a theory as to why people get MS. It's still such a huge mystery. I hope one day soon we'll know why and then maybe that will lead to a cure.