More than 85,000 people in the UK are thought to have the auto-immune condition which is caused by the loss of nerve fibres in the brain and spinal cord.
There is evidence that people from parts of Northern Europe which get little sunshine are at greater risk of developing MS.
Dr Colleen Hayes and colleagues at the University of Wisconsin-Madison, believe vitamin D3 helps to control cells known as T lymphocytes which are responsible for MS.
Dr Hayes said: “MS is currently incurable but environmental factors, such as vitamin D3, may hold the key to preventing MS and reducing its impact.”
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