Vitamin B-12 is one of the type of vitamins. It is essential component of our food. It should present in our diet. It is needed because it's lackness may cause low blood and tissue levels. It can be found in cereals and pulses. It plays an important role in DNA synthesis, energy production, nerve cell growth, red blood cell formation and neurological function. It can reduce the risk of heart disease, vision loss, infertility ,etc.