Hi Lisa,   I am just now reading this.  I, too, have MS.  Yesterday I was told that my Vitamin D Level came back at 15.  My GP prescribed 50,000 IU of Vitamin D which I will begin tonight, hopefully.   I wanted to ask you who has been working with you on the Vitamin D levels?  Was it a GP or your neurologist.  If it wasn't your neurologist, did he/she have any light to shed on the subject?   You said that you began to feel better once your levels began to rise.  Does that mean it took months before you began to feel any improvement in symptoms?   I am so hopefuly that finally there may be something I can do to improve my symptoms without medicines with multiple side effects.  I almost rejoiced at the result of the Vitamin D test after over a decade of complaining of fatigue, mucle pain, IBS, and others and being basically told, "You have MS and there is no cure.."  Perhaps there is hope that I may see improvement?   Thank you so much for your column and the work you do!