High dose of vitamin D is safe for people with MS and may help regulate the body's hyperactive immune response, researchers said.
    
"These results are exciting, as vitamin D has the potential to be an inexpensive, safe and convenient treatment for people with MS," said Peter Calabresi, director of the Johns Hopkins Multiple Sclerosis Center in US.
    
"More research is needed to confirm these findings with larger groups of people and to help us understand the mechanisms for these effects, but the results are promising," said Calabresi, also a professor at the Johns Hopkins University School of Medicine.
    
Low levels of vitamin D in the blood are tied to an increased risk of developing MS. People who have MS and low levels of vitamin D are more likely to have greater disability and more disease activity.
    
For the study, 40 people with relapsing-remitting MS received either 10,400 international units or 800 international units of vitamin D supplements per day for six months. Patients with severe vitamin D deficiency were not included in the study.

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