Vitamin B-12 1000 mcg - 100 TabletsEssential for Energy Production Vitamin B 12 is a water soluble vitamin necessary for the maintenance of a healthy nervous system and for the production of energy from fats and proteins. Vitamin B 12 is also essential for the synthesis of DNA during cell division and therefore is especially important for rapidly multiplying cells, such as blood cells. In addition, adequate intake of vitamin B 12, along with folic acid and vitamin B 6, is critical for