http://eartotheground.typepad.com/weblog/2008/09/in-a-prior-post-it-was-noted-that-certain-b-vitamins-those-studied-were-thiamin-riboflavin-niacin-pyridoxine-and-cobalam.html
A chemical derived from a Chinese medical herb shows potential promise
http://eartotheground.typepad.com/weblog/2008/09/in-a-prior-post-it-was-noted-that-certain-b-vitamins-those-studied-were-thiamin-riboflavin-niacin-pyridoxine-and-cobalam.html