Vitamin B3, also known as niacin, is a water-soluble vitamin that plays an important role in energy metabolism. It helps your body convert carbohydrates, fats, and proteins into energy that your cells can use, and is important for the healthy functioning of your digestive system, skin, and nerves.
Niacin can also help lower cholesterol levels in the body, which can help reduce the risk of heart disease. Additionally, niacin may have benefits for brain function and may help reduce symptoms of depression and anxiety.
Niacin is found in a variety of foods, including meat, fish, poultry, nuts, and whole grains. Deficiency in vitamin B3 can lead to a condition called pellagra, which can cause symptoms such as skin rashes, diarrhea, dementia, and even death in severe cases. However, deficiency in vitamin B3 is rare in developed countries, as many foods are fortified with this essential vitamin.