http://www.lef.org/LEFCMS/aspx/PrintVersionMagic.aspx?CmsID=113616Vitamin D and Multiple Sclerosis: a panacea?
Mainstream medicine has failed to recognize the pivotal role of vitamin D in regulating the overactive immune system in MS patients.
Greater than 30 years have passed since vitamin D was originally hypothesized to be an important environmental determinant of the prevalence of MS (Goldberg 1974; Craelius 1978). During the three decades following the initial linking of vitamin D and MS, evidence has continued to mount. It is now known that MS occurs more frequently in individuals with lower blood levels of vitamin D. A study published in the prestigious Journal of the American Medical Association found that, compared to those with the highest vitamin D blood levels, those with the lowest blood levels were 62% more likely to develop MS.
MS attacks occur less frequently during seasons corresponding with the highest exposure to sunlight; since vitamin D synthesis depends upon exposure of the skin to sunlight, the summer months also bring the highest blood levels of vitamin D (Tremlett 2008). A recent study has quantified the impact of vitamin D blood levels on risk for MS relapse – for each 4 ng/ml increase in 25-hydroxy vitamin D in the blood, the risk for MS relapse is reduced by 12%. The investigators who conducted this study concluded that “Clinically, raising 25-hydroxy vitamin D levels by <20 ng/ml> could halve the hazard of a relapse” (Simpson 2010).