Have a look at another PD forum thread, on the benefits of magnesium.
http://pduk.org/forum/index.php/topic,1955.0.html
Magnesium can also be added to the list of beneficial substances which reduce BBB permeability.
http://ep.physoc.org/cgi/content/abs....2007.039966v1
"Magnesium sulphate treatment decreases blood-brain barrier permeability"

How many more do we need to find before the medical profession takes some notice.
Ron