Vitamin B12 is an essential nutrient that's involved with a lot of important processes in the human body. [1] Food is the primary source for this nutrient, with supplements being the secondary source for some people. Vitamin B12 is structurally the largest and most complex of all the vitamins known to man. Interestingly enough, vitamin B12 is integral to normal energy metabolism in all cells of the body as well as amino acid and fatty acid metabolism. Additionally, B12 is extremely important in a myriad of other vital physiological processes […]