Niacin (vitamin B-3 or nicotinic acid or vitamin PP) is one of the B-complex vitamins, necessary for the good health of the body. NOW Flush-Free Niacin is designed to be released gradually into the bloodstream, releasing histamine.    Histamine is a nitrogenous organic compound that dilates blood vessels and breaks down the protein needed to coagulate blood.

        According to research by Harvard Health Publication, niacin alone, when taken alone, can lower "bad" LDL cholesterol levels by 15%, and increase "good" HDL cholesterol levels by 20%. In addition, niacin, when taken alone, may lower triglyceride levels. When taken in combination with a statin, it can lower LDL cholesterol levels by 10%.