Hi, some things to ponder: maybe you have more going on than just a D deficiency as the article in the link above seems to suggest. Maybe show the article to your doctor and see if he/she would advise brief, daily sun exposure, which I hear is typically shunned for MS patients. Perhaps you are on glucocorticoids? Studies have shown that drugs such as glucocorticoids that MS patients take inhibit vit D. See this in my profile in the section on "Tips to take to your doctor" and you'll find a reference to a journal article that talks about medications and vit D inhibition.

You could be low on one or more of the vitamin D co-factors. See Dr. John Cannell's website, www.vitamindcouncil.org. His email is info@vitamindcouncil.org (on his website). The co-factors are magnesium, zinc, boron, vitamin K, and very, very small amounts of vitamin A. He says that when magnesium is low in the body (may not show up on a blood test), you will not be able to absorb vit D efficiently and D will not work as efficiently.

A friend with MS who was taking vitaminD and high doses of calcium ended up with high blood calcium. No-one can say for sure what caused the high calcium, but he is on low calcium and low D now. Be sure your doc checks your calcium regularly. His doc somehow overlooked it fora year. I've read studies of other MS cases where large doses of vitamin D are given successfully. It's so difficult to pinpoint. I feel sorry for both the patients and the doctors.

I have MS and have noticed thatinspite of taking 50,000 ICU of Vitamine D a week I cannot build up my Vitamin D level.  I seem to expend more that I take in.  Everone that I talk to I tell them to take Vitamin D and Viamin C on a regularly basis since they are so important 4 the immune system and it you have MS you cannot get enough