what is niacin flush
High doses (50 mg or more) of niacin can cause side effects. The most common side effect is called niacin flush, which is a burning, tingling sensation in the face and chest, and red or flushed skin.Taking an aspirin 30 minutes prior to the niacin may help reduce this symptom.he most common side effect is called niacin flush, which is a burning, tingling sensation in the face and chest, and red or flushed skin. Taking an aspirin 30 minutes prior to the niacin may help reduce this symptom.