Hi Carolyn,
It always comes back to the BBB. I found
"Vitamin D is vital for the maintenance of the blood/brain barrier"
in
http://www.davidwheldon.co.uk/ms-cpn-qa.html
Very interesting, I found a forum discussing the influence of the BBB permeability on MS!
http://www.thisisms.com/ftopicp-16313.html
Someone even recommended curcumin as a supplement.!!