USA Fitness Guide MS relapses Researchers warn against effective vitamin D doses Sunbathing ensures vitamin D supply - in summer The protective effect of vitamin D. The higher the vitamin D level in the blood, the lower the risk of MS Vitamin D reduces the number of foci Related articles Multiple sclerosis - symptoms and disease course Multiple sclerosis (MS) is a devastating disease with little hope of true healing. In USA Fitness Guide Germany, around 150 out of 100,000 people suffer from multiple sclerosis.