Rather than stimulating your body, niacin is able to unlock the energy that is available within the calories you consume. This means your body is able to achieve sustainable energy without any crash. While taking niacin pre workout supplements, niacin may also lead to flushing sensation which causes the skin tingle. When you realize this, known that this is normal and the effects will disappear after a few minutes. Just don’t worry if your pre-workout supplementation contains too much niacin. In fact, the more niacin, the better the results.