Looks like they have isolated something from the Cordyceps mushrooms to help in MS.
Cordyceps
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3694567/
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587886/
http://www.naturalnews.com/039361_cordyceps_gilenya_multiple_sclerosis.html