Niacin – the B Vitamin – Can Too Much Hurt?

By: Dr. John Wigneswaran MD What is Niacin? Niacin (also known as vitamin B3 and nicotinic acid) is an organic compound and one of the 20 to 80 essential human nutrients that your body needs. The current recommended daily allowance (RDA) is 20mg. Doses higher than that can be harmful (read below), with some supplements and prescription products containing 250mg …