Vitamin B3, also known as niacin, is a water-soluble vitamin essential for various bodily functions, including energy metabolism and the maintenance of healthy skin and nerves. The recommended daily allowance for Vitamin B3 varies by age and gender. Niacin plays a pivotal role in converting food into energy and is instrumental in DNA repair. It is associated with skin health and is often used in supplements to help manage cholesterol levels. A deficiency in Vitamin B3 can lead to pellagra, a condition with skin, digestive, and neurological symptoms. Recognizing the significance of niacin in energy production, skin health, and overall well-being underscores its role in maintaining vitality and a balanced diet.