Niacin, also known as vitamin B3, is an essential nutrient that helps convert food into energy and supports the nervous system. Foods rich in niacin include meat, fish, poultry, and whole grains. These sources provide a significant amount of niacin, making them important for maintaining overall health. In addition to animal products, legumes, nuts, and seeds are also good sources of niacin. Some fortified cereals and bread contain added niacin, making it easier to meet daily requirements. Including a variety of these foods in your diet can help ensure adequate intake of this vital vitamin.