Which of the following vitamins contain cobalt?

Q. Which of the following vitamins contain cobalt?
Answer: B12
Notes: Cobalt is also an essential trace element for humans. It is found at the centre of vitamin B12 and a range of other co-enzymes called cobalamins. Even though the body contains only 2–5 mg of vitamin B12, its involvement in the production of red blood cells means it is vital to life.

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