Ohh yeah, that niacin flush… I was on a niacin prescription once and was warned about the flush. I was not prepared for what that actually felt like. They said it would be tingly, like pins and needles. It actually felt like I rolled around in hot sauce after exfoliating with sandpaper. I thought was having an allergic reaction to my bed sheets for a few minutes before it finally clicked. I was almost ready to head to the ER.