Vitamin B12 is required for the normal functioning and development of the nervous system, blood cells and brain. It’s a water soluble vitamin which is used to elevate mood, improve energy levels and concentration, to boost immune system and in sleeping disorders. Severe deficiency of Vitamin B12 can lead to pernicious anemia. It is also used for lowering high homocysteine levels which may contribute to heart disease, asthma, AIDS, to prevent cervical and other cancers, memory loss, osteoporosis, allergies and skin infections. It also helps to prevent atherosclerosis, multiple sclerosis, and kidney and gum disease. Vitamin B12 is added in almost all multi-vitamin B complex supplements. Deficiency of Vitamin B12 in infants can lead to megaloblastic anemia, delayed developments and movement disorders. Studies have proved that when used in combination with folic acid, it can prevent heart diseases.