Cobalamin, also known as vitamin B12, is a micronutrient with an important role in the function of the central nervous system, as well in the development of red blood cells in bone marrow. Vitamin B12 can be found mainly in animal-sourced food like meat, fish and eggs. Vitamin B12 deficiency is associated to low stomach acid production, gastric absorption impairment and low animal-sourced food intake. Vitamin B12 deficiency has been related to several medical conditions, including pernicious anemia, gastrointestinal malfunctioning and neurological problems.