b3 is a type of vitamin B that plays a crucial role in energy production and the metabolism of fats, proteins, and carbohydrates. It is also known as niacin and is essential for maintaining healthy skin, nerves, and digestive systems. This vitamin can be found in various foods, including meat, fish, eggs, and green leafy vegetables. b3 can also be synthesized in the body from the amino acid tryptophan, which is found in protein-rich foods. Adequate intake of b3 is important for overall health and well-being.