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.
There are six kinds of quarks - up quarks, down quarks, strange quarks, charm quarks, bottom quarks, and top quarks. Their names don't really mean anything, just that they are different kinds of quarks. A proton is made of two up quarks and a down quark, and a neutron is made of two down quarks and an up quark. A force called the strong nuclear force holds the quarks together. Up quarks have a little bit of mass, but most of the mass of a proton comes from the strong nuclear force itself, rather than from the quarks.