The human liver is considered by many to be the most crucial organ. It is responsible for cleansing blood, protein synthesis, biochemical production, glycogen storage and it even plays a major role in metabolism.
A very minor reduction in function can result in less than optimal performance. A wide range of products out there can impair liver function, some rather dramatically. Alcohol, pharmaceutical or recreational drugs, aflatoxins and even common over-the-counter drugs such as acetaminophen in higher doses can tax the liver.