Vitamin D May Protect Against MS
There is new evidence supporting the idea that vitamin D helps prevent multiple sclerosis, but it is too soon to recommend taking the vitamin to lower your risk, researchers say.
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MS Risk and Racial Groups
Because dark-skinned people do not make vitamin D through the skin as easily
as light-skinned people, separate analyses were conducted among whites, blacks,
and Hispanics. UV rays from the sun allow vitamin D to be made in the skin.
The investigation revealed that among whites, people with the highest
circulating vitamin D levels had the lowest MS risk. Compared with whites with
the lowest levels, those with the highest were found to have a 62% lower risk
for developing the disease.
The strongest association was seen among the youngest study
Vitamin D and the Immune System
Ascherio says the findings add to the mounting evidence supporting a role
for vitamin D in regulating the immune system and suppressing autoimmune
Earlier research from the Harvard team suggested a protective role for
vitamin D against rheumatoid
arthritis, another autoimmune disease.
Other researchers have reported that vitamin D deficiency may increase the
risk of a wide range of medical maladies, including heart
disease, diabetes, unexplained
muscle and joint pain, and certain cancers.
William F. Finn, MD, who has been studying vitamin D for many years, agrees
that large, randomized trials are needed to confirm the vitamin’s role in
protecting against MS or any of these diseases.
But he says it is not too soon to recommend that people take vitamin D in
Most multivitamins contain 400 IU of vitamin D, which has been thought to be
a sufficient daily dosage. But Finn argues that most people need between 800
and 1,000 IU a day, especially in the winter when they are getting less of the
vitamin from sun exposure.
He says blacks and other dark-skinned people may need even more than
Finn is a professor of medicine at the University of North Carolina at
"It is important to discuss this with your doctor, but I believe that
most people could benefit from getting more vitamin D," he says.
"Vitamin D deficiency or insufficiency is a very common problem in the