This study appears to strongly reinforce the notion that vitamin D levels are closely associated with the amount of disability in MS:
1: J Neurol. 2007 Apr 11; Links
Vitamin D levels in people with multiple sclerosis and community controls in Tasmania, Australia.van der Mei IA, Ponsonby AL, Dwyer T, Blizzard L, Taylor BV, Kilpatrick T, Butzkueven H, McMichael AJ.
Menzies Research Institute, Private Bag 23, Hobart, Tasmania, 7001, Australia, ...