Vitamin B12 is a nutrient that helps keep your body's blood and nerve cells healthy and helps make DNA, the genetic material in all of your cells. Vitamin B12 also helps prevent megaloblastic anemia, a blood condition that makes people tired and weak.
Vitamin B12 is crucial to various bodily processes, including :
normal functioning of the brain and nervous system.
cognitive functioning (ability to think)
formation of red blood cells and anemia prevention.
helping create and regulate DNA.
possibly preventing congenital abnormalities.