Cyanocobalamin is the most common and widely produced form of the chemical compounds that have vitamin B12 activity.
For example, the hadron constituents of atomic nuclei, neutrons and protons, have charges of 0 e and +1 e respectively; the neutron is composed of two down quarks and one up quark, and the proton of two up quarks and one down quark.
At the basic level, the nucleus of an atom is made up of protons and neutrons. At the more fundamental level, the nucleus of an atom is made up of quarks and other sub-subatomic particles, such as leptons and gauge bosons. Two down quarks and one up quark make up a neutron, while one down quark and two up quarks make up a proton.