BPSC 48th to 52nd Exam Prelims 2008 Solved Paper

Cobalt is also an essential trace element for humans, and is found at the centre of vitamin ${\mathit{B}}_{12}$ and a range of other co-enzymes called cobalamins. Even though the body contains only $2-5\mathit{m}\mathit{g}$ of vitamin ${\mathit{B}}_{12}$ its involvement in the production of red blood cells means it is vital to life.