An analysis of the blood serum of more than 7 million U.S. military personnel, 257 of whom had multiple sclerosis (MS

An analysis of the blood serum of more than 7 million U.S. military personnel, 257 of whom had Multiple sclerosis (MS), found that vitamin D is associated with a lower risk of multiple sclerosis.

MS cases were identified through physical disability databases and medical-record reviews.
The benefits, at least among Caucasians (the majority of the study participants), included a 41 percent decrease in MS risk for every 50-nmol/L increase in blood levels of vitamin D.

Those whose vitamin D levels were in the top 20 percent saw their MS risks plunge by 62 percent compared to those in the lowest 20 percent.

Vitamin D is known to be a potent immunomodulator, and increasing vitamin D levels among adolescents and young adults could lead to a reduction in MS cases.

Vitamin D or sunlight is a wonderful buffer of metabolic acids which is the primary cause of MS.
I recommend at least 20 to 30 minutes a day of natural sunlight to help reduce metabolic acids and thus reduce the risk for MS.

References:
Journal of the American Medical Association December 20, 2006; 296(23): 2832-2838
Reuters December 19, 2006
Medpage Today December 19, 2006

more information's at: http://www.dreddyclinic.com/findinformation/mm/multiplesclerosis.htm