The main function of the human liver is to process and metabolize nutrients, detoxify harmful substances, and produce vital proteins. As a vital organ, the liver regulates carbohydrate, fat, and protein metabolism, converting nutrients from food into usable energy. It also manufactures proteins necessary for blood clotting and produces bile, which aids in the digestion of fats. Additionally, the liver plays a crucial role in filtering the blood, removing toxins, medications, and waste products. Its ability to regenerate itself after injury or damage highlights its essential function in overall health and metabolic balance.