The average body has less than 1 milligram of cobalt and it is stored in the muscles, bone, liver and kidneys as a component of vitamin B12.
Cobalt facilitates some functions of vitamin B12 such as DNA synthesis, red blood cell production, nerve functions, and cyanide detoxification.
It is recommended by the World Health Organization that the daily intake is 1 microgram; no official daily intake values have been established.
Deficiency symptoms of cobalt would reflect those of vitamin B12 such as nerve disorders, improper cell formation, and pernicious anemia. These symptoms need additional nutrients to alleviate the deficiency, however.
Sources in the Diet
Green, leafy vegetables, some fish, liver, kidney, cereals and milk all have cobalt.