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.
A proton has two up-flavored quarks and one down-flavored one, while a neutron has two down-flavored ones and one up-flavored one. Mixing and matching these types gives different particles. For exmple, three up-type quarks stuck together makes a particle called a Delta++, which a charge of +2.