I have heard that niacin helps clean your system out; is this true?
Niacin causes the blood vessels to widen, thus, hopefully allowing greater blood flow and freeing up the little clogged blood vessels near fatty tissues that store lots of toxins. Those blood vessels pick up toxins, eventually allowing the toxins to get flushed out in the urine or the sweat. That's the theory, anyway. Niacin is often used in saunas to help detoxify more quickly.