Niacin supplements treat the lack of natural niacin production in the body, lower cholesterol, and decrease the risk of heart attacks in people who have already suffered them, reports Drugs.com. The FDA has approved niacin to treat pellagra, says WebMD.
There is some evidence that niacin may also help reduce the risk of cataracts, osteoarthritis, Alzheimer’s disease and Type 1 diabetes, notes WebMD. Niacin is a B vitamin that animals and plants produce naturally. It is also in many foods, including meat, fish and eggs. Vitamin supplements are another way to get the adequate amount of niacin to keep the body functioning properly.