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Despite observations in clinical practice, to date researchers have been unable to connect a deficiency of vitamin D to multiple sclerosis in randomized trials. Why?
- Delivering vitamins in supplemental pill form is less effective than other methods
- The doses of vitamin D used in trials have been too low to show a therapeutic effect
- Patients were not treated with vitamin D long enough for it to make a noticeable difference
- All of the above
- None of the above
- Vitamin D does not significantly influence MS