B-12, is also known as cobalamin, and is key for optimum health. B-12 is involved in many important physical processes, that include the formation and maintenance of blood cells, nerve cells, and the formation of DNA, the complicated genetic stuff inside the cells. Vegans,in addition to being at risk of being skinny with pasty skin, are at risk for B-12 deficiency, and should make sure that they get enough of the vitamin from supplements or foods.
Sources of B-12
Vitamin B-12 is made by a bacteria. Neither plants nor animals are able to make B-12 on their own. Animals get vitamin B-12 by eating food that has been exposed to microorganisms that produce it. The animals then become sources of B-12 for people who consume animals or animal products. Since plants do not naturally contain vitamin B-12, vegans need to include foods that have been fortified with vitamin B-12, or take supplements to obtain the amount necessary for good health.