The largest internal organ in the human body is the liver. Weighing about three pounds on average, the liver performs over 500 vital functions, including detoxification, protein synthesis, and the production of biochemicals necessary for digestion. It plays a crucial role in metabolizing nutrients absorbed from the digestive tract. The liver stores vitamins, minerals, and energy in the form of glycogen, releasing glucose into the blood when needed. Additionally, it helps regulate cholesterol levels and produces bile to aid in the digestion of fats. Its importance is paramount for overall health and metabolic balance.