Flush-free or no-flush niacin is a form of nicotinic acid also known as inositol hexaniacinate. Flush-free niacin gets its name from its ability to alleviate side effects like flushing that are seen with other forms of niacin. Niacin, or vitamin B-3, is a supplement known for its ability to lower cholesterol and prevent heart disease. Inositol is a direct precursor of phospholipids which are a major component of cellular membranes. It helps to maintain proper electrical energy and nutrient transfer across the cell membrane. It also acts as a lipotropic which converts fats into other useful products. It helps establish healthy cell membranes, which facilitate nerve impulses.