There is a lot of information out there about glutathione and autoimmune diseases. One of the clearest discreptions of it's function that I have found is on a site relative to Chronic Fatigue (CFS) but the gist of it would also apply to MS.
The article in the link below covers what gluathione is and it's roles, things that cause glutathione depletion, consequences of glutathione depletion on your immune system, potential ways to improve your glutathione...
Here's the link
http://www.personalconsult.com/articles ... tigue.html
Hope this helps.