Niacin, or vitamin B3, is too dangerous and should not be used routinely by people looking to control their cholesterol levels or prevent heart disease, doctors say. The warning comes following recent evidence showing the vitamin does not reduce heart attacks or strokes, and instead is linked to an increased risk of bleeding, diabetes and death. Niacin has long been used to increase people's levels of high-density lipoprotein (HDL), or the "good" cholesterol, and has been a major focus of research into heart disease prevention for several decades. Considering the alarming side effects of niacin, researchers now say the vitamin shouldn't even be prescribed anymore.
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