Cobalt - A Central Element in the Biological Periodic Table

Cobalt with its neighbours, iron, manganese, nickel and copper, has a vital rôle in a number of biochemical metalloenzyme reactions.

Biological Periodic Table

Bulk elements are shown with ovals around them, the elements in small type are either not essential, or their essentiality is uncertain, even though they have been measured in the human body.

See Frausto da Silva and R.J.P. Williams seminal text, "The Biological Chemistry of the Elements, The Inorganic Chemistry of Life" in the bibliography