Activated charcoal has been used as an antidote to many poisons and overdoses. It has been used for kidney problems, skin diseases, intestinal gas, overdoses, and even whitening teeth as well. Activated charcoal is especially helpful with detoxing the body when used in balneotherapy foot soaks as the feet are truly one of the main centers of the body. Many diseases and ailments appear on the feet before anywhere else, and many people believe the body can be healed through the feet.