Cobalt – Uses, Benefits, Sources and Dosage Cobalt is important trace mineral and an integral part of the structure of vitamin B12 (cobalamin). It plays the role of cofactor for the formation of thyroid hormone called as thyroxine. Cobalt is needed in the small amount in combination with vitamin B- 12. Recently it has been found that cobalt is necessary for the production of blood cells. It helps in the proper function of all the cells in our body. It