Bi 12 Injection PT Infion Book Vitamin B12 Shot Online Manhattan IV Therapy How Naso B12 Works Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta analysis Irish Journal of Medical Science (1971 ) Vitamin B 12 intramuscular injections are also used therapeutically to help restore energy and combat various symptoms related to such deficiencies. Vitamin B 12 is essential to the development of healthy blood cells, nerve These highlights do not include all the information needed to use NASCOBAL NASAL SPRAY safely and effectively. See full prescribing information for NASCOBAL NASAL SPRAY. NASCOBAL (cyanocobalamin nasal spray)Initial U.S. Approval: 1942