I am testing to have an O during flushing niacin in several months ago, and i have had during several months (3 months) : severe allodynia. It was one of worst experience of my life. I don't know the link between niacin flush and O, or if this allodynia was due to my phobia of the seconds effects of niacin, but i would tell that. My shirt on my skin caused me a pain terrible. I don't want to fear you my brothers. One of them have had already an allodynia after taking niacin ? Thx bro. Niacin worked on me, but after this terrible experience, i stopped that. Good luck for all.