Bentonite clay has been used for healing purposes since before recorded history. It is made from a mixture of volcanic ash and sea mud. It draws toxic material out of the body if taken internally, and it reduces pain and infection in open wounds. Clay molecules carry negative ions in its minerals, which attract positive ions located in impurities found in the intestinal tract. In a process called adsorption, the clay draws the impurities to itself like a magnet and holds on to them until the body can eliminate both.