Niacin is also known as vitamin B3 or nicotinic acid. One of the 20 to 80 essential human nutrients.
Niacin appears to reduce the risk of cardiovascular disease. Niacin increases the level of high-density lipoprotein (HDL) or "good" cholesterol in blood, and therefore it is sometimes prescribed for people with low HDL, who are also at high risk of a heart attack.
Insufficient niacin in the diet can cause nausea, skin and mouth lesions, anaemia, headaches, and tiredness.