I came a cross a thread on longecity called "niacin neurotoxicty" and its got me a little worried. this is the study: http://qjmed.oxfordjournals.org/content/98/3/215.full and this is the thread: http://www.longecity.org/forum/topic/20190-niacin-neurotoxicity/ . Niacinamide is really doing wonders for my arthritis and anxiety but i stopped taking it after reading that. I'm pretty young but Developing parkinsons is probably one of my biggest fears so this is kind of freaking me out. There are some very intelligent people on this forum and I was wondering if you could please give me some insight into this. Thanks