Niacin plays an essential role in the activities of enzymes involved in carbohydrate and fat metabolism, nervous and digestive system functioning, manufacture of sex hormones, and maintenance of healthy skin. The coenzyme forms of niacin (NAD and NADH) are electron carriers and play an important role in glycolysis and the Krebs cycle, two important energy-producing cycles in the body. Niacin may also help to prevent or treat a number of other disorders, from arthritis and depression to diabetes. Niacin as vitamin B3, niacin has earned a reputation (in supplement form) as a natural cholesterol-lowering agent that often rivals prescription drugs in mild to moderate cases. See the links below for more details.
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