Hi I was wondering if someone could tell me in plain English if Niagen/Niacin supplement is good for undermethylators. I am undermethylator plus CFS plus "pure" OCD. Seems that NAD+ is a methyl donor (or I may have gotten it wrong, please correct me), while excess Niacin (B3) uses up methyl groups. At least that is what my read is from looking at various threads here. One such thread is here - http://forums.phoenixrising.me/index.php?threads/anyone-trying-niagen.30636/. So it would be nice if someone with similar symptoms has experienced definitive - positive or negative - outcome after trying Niacin/Niagen supps. Thoughts?