Vitamin B12 is a water-soluble vitamin that aids in the maintenance of healthy blood and nerve cells.
"There is also interest in the role of B12 in preventing cardiovascular disease, stroke, and dementia," says Kate Zeratsky.
The National Institutes of Health (NIH) Office of Dietary Supplements claims that vitamin B12 "helps prevent megaloblastic anemia.
Vitamins are often associated with eye health, but they also play a role in the body's ability to turn the molecules of food into fuel.
However, scientists believe that taking huge doses of vitamin B12 won't significantly boost energy levels .
In spite of its importance, vitamin B12 does not need as much of the body's daily intake as the other B vitamins, according to Joel Mason.
Tufts University's Jean Mayer USDA Human Nutrition Research Center on Aging. "Therefore, deficiencies typically manifest in a slow, stealthy fashion."