Vitamin B12 contributes to: Normal energy yielding metabolism Normal functioning of the nervous system Normal homocystenine metabolism Normal psychological function Normal red blood cell formation Normal function of the immune system Reduction of tiredness & fatigue Has a role in the process of cell division Vitamin B12 is a water soluble B vitamin naturally found in fish, dairy produce, organ meats, beef and pork. Vitamin B12 contributes to: Normal energy yielding metabolism Normal functioning of the nervous system Normal homocystenine metabolism Normal psychological function Normal red blood cell formation Normal function of the immune system Reduction of tiredness & fatigue Has a role in the process of cell division Vitamin B12 is a water soluble B vitamin naturally found in fish, dairy produce, organ meats, beef and pork.