Niacin

Niacin helps to lower levels of LDL cholesterol, often called “bad” cholesterol, in the body and raise levels of HDL, or “good,” cholesterol. Niacin, or vitamin B3, is also used to treat conditions like type 1 and type 2 diabetes. Niacin has also shown some promise in treating Alzheimer's disease and lowering the risk of a second heart attack in men who suffer from cardiovascular disease.