Cobalt is a chemical element normally found in the form of metal and used in metalworking. In medicine, it belongs to the family of dietary minerals. Dietary minerals are the elements gained through diet and present in an infinitesimal quantity in the organism. They are nevertheless indispensable to an organism. Cobalt enters the composition of vitamin B12, which gives it its other name, Cobalamine. The rays emitted by radio-active cobalt are often used in radiotherapy for the treatment of certain cancers.