Vitamin B12 (cobalamin) has several functions and health benefits.  Vitamin B12 supports energy metabolism by working with enzymes involved in the breakdown of nutrients, such as amino acids. It is also vital for the normal formation of blood cells, and is involved in DNA synthesis and renewal. at increased risk of deficiency.Vitamin B12 (Cobalamin) is also the only vitamin that contains cobalt, a trace mineral. It is essential for the normal functioning of all body cells, especially those of bone marrow, gastrointestinal tract and nervous system. Vitamin B12 is necessary for the formation of red blood cells and haemoglobin. Without adequate vitamin B12 the red blood cells enlarge and do not mature properly, leading to a potentially dangerous condition known as pernicious anaemia. Mild vitamin B12 deficiency is common with symptoms including lethargy, forgetfulness, tinnitus and fatigue. Vitamin B12 is found in foods of animal origin and those consuming a vegan diet are at increased risk of deficiency.