Vitamin B12 is an essential nutrient that we get from our food. B12 occurs naturally in animal food sources, like meat and dairy. It is not naturally found in plant-based foods, although through modern food processing practices, we can fortify certain foods with B12. Thus, people who do not eat meat products, like vegetarians and vegans, can still get this nutrient from eating fortified foods.
B12 plays a pivotal role in the human body. It keeps your nerve and blood cells healthy, and it helps create DNA in all of our cells. Because of its role in keeping our blood cells healthy, B12 is an essential ingredient for preventing anemias. People who do have anemia often cause people to feel tired and weak.