I am reading where doses of up to 40 thousand vitamin D units a day can diminish and stop M.S. symptoms. Read here google high dose vitamin D for MS
So change is occuring, but this dosing level is not accepted as "Standard of Care" by the Medical community. Stay tuned, but don't hold your breath as disimination of this information and double blind studies are slow to occur. I will remind you that a standard dose of 4,000 iu of vitamin D was thought to cause possible toxicity ten years ago. Some still believe that in the medical community and are ignorant of the benefits of vitamin D.
ANYONE, taking vitamin D should be taking magnesium too. It should be easily absorbed and free of heavy metals form of it. I would not take a magnesium supplement that was not certified to have heavy metals removed! One additional comment. Magnesium oxide is the poorest of all choices to take magnesium because it is more valuable as a laxative. The consequences of not taking magnesium is to increase odds that you will have a heart irregularity. Lack of magnesium can cause muscle spasms. This is not a good thing!
What I do is take magnesium Chloride that has been treated to remove heavy metals. I use it as a spray directly on sore joints and muscles. It works quite well and is absorbed through the skin. This form is called magnesium oil, though there is no oil in it. Another way is to take it mixed with a juice. Of course, taking it as a oral preparation does not work as well on sore joints and muscles but does meet the general recommendation of the proper dose. It comes in a powdered form and it obtainable on line. I buy it by the pound and mix it as a spray with distilled water and with orange juice as a oral supplement.
I am also seeing that vitamin D, magnesium and Boron are all important for general health and strong bones. Boron is another subject to check out. I have delt with this in a post months ago.