niacin is also thought to improve blood flow.
I took this as part of a cholesterol lowering vitamin supplement. Had a full body flush and it scared the crap out of me. Did it help me get/keep an erection I was to scared to notice. So if you try it make sure you read the label first and don't take the ones that are 2500% recommended daily intake.
took at 100 by accident and thought she was on fire from the flushing. guess best to take caution with it?