Vitamin B12 250mcg (Webber Naturals) is important for the functioning of your nervous system and for energy production. Also known as Cyanocobalamin, your body needs sufficient B12 levels in order to produce genetic materials and for the synthesis of red blood cells so carbon dioxide can be removed from your body and carried to your lungs for you to exhale. If you are deficient of Vitamin B12, your metabolism will not operate smoothly.