I've had MS since 2001 and had flare ups usually twice a year. Although I have mild MS with tingling and with flare up moderate pain I've had very good results with taking vitamin D daily. Early in 2011 I had another MRI to determine the growth of lesions because of blurring in my left eye in my last flare up. The blurring went away but I was again asked to consider the MS drugs. Because of the mild MS symtoms I am fortunate to have, I didn't think the risk of the side affects of these drugs was in my best interest. I had read about vitamin D and asked my doctor about it. She gave me a blood test to make sure I didn't already have too much in my system naturally and after that gave me the go ahead. I take one tablet 1000mg daily. I haven't had a flare up since. Almost 3 years! I'm no doctor or researcher but so far so good. Just thought I'd throw that out there for what it's worth.