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Niacin is an essential B vitamin, but new research reveals that too much of it may harm your heart. Found in many foods that millions of Americans eat, excessive amounts of niacin can trigger inflammation and damage blood vessels, scientists report in the Feb. 19 issue of the journal Nature Medicine. “The average person should avoid niacin supplements now that we have reason to believe that taking too much niacin can potentially lead to an increased risk of developing cardiovascular disease,” senior study author Dr. Stanley Hazen, chair of cardiovascular and metabolic sciences at the Cleveland Clinic’s Lerner Research Institute, told NBC News. The recommended daily allowance of niacin for men is 16 milligrams per day, while it is 14 milligrams a day for women who are not pregnant, according to the Mayo Clinic. Ever since the 1940s, when grains and cereals began to be fortified with niacin, Americans have gotten plenty of the vitamin in their diet. The move to fortify those foods was prompted by evidence suggesting that very low levels of niacin could trigger the development of a potentially fatal condition called pellagra, said Hazen, who is also co-section head of preventive cardiology at the Heart, Vascular and Thoracic Institute. Ironically, niacin supplements were once prescribed by doctors to improve cholesterol levels. Dr. Amanda Doran, an assistant professor of medicine in the division of cardiovascular medicine… read on > read on >