Niacinamide is another such substance and seems to work synergistically with caffeine. This duo has shown effectiveness in virtually all major "autoimmune" diseases - i.e. MS, lupus, RA, diabetes (Type I), etc.
http://www.ncbi.nlm.nih.gov/pubmed/19879252
http://www.ncbi.nlm.nih.gov/pubmed/19879252