Niacin is an important nutrient for the body that is also known as vitamin B3. There are several terms that can be used as synonyms for niacin, such as nicotinamide, nicotinic acid, nicotinate, and niacinamide. These terms refer to the different forms of niacin that are used by the body to maintain good health. Nicotinic acid is the form of niacin that is used in supplements to boost blood flow and cholesterol levels, while nicotinamide is the form that is used for skin health and energy production. Niacin is a crucial nutrient that is essential for brain function, the production of red blood cells, and maintaining healthy skin, which is why it's important to consume enough through diet or supplementation.