Vitamin B3, also known as niacin, is a water-soluble vitamin that plays a crucial role in converting food into energy. It helps the body use carbohydrates, fats, and proteins effectively. Additionally, vitamin B3 is important for maintaining healthy skin, nerves, and digestive systems. It can be found in various foods, including meat, fish, eggs, and whole grains. This vitamin also supports the production of NAD and NADP, two coenzymes essential for cellular metabolism. A deficiency in vitamin B3 can lead to pellagra, a condition characterized by symptoms such as dermatitis, diarrhea, and dementia. Ensuring adequate intake through diet or supplements is important for overall health.