Optimal Vitamin B12 Dosage and Treating Deficiency B12 Injections vs. Oral Supplements: Which Is Better? Low vitamin B12 can affect how you feel. Professional B12 injections, delivered with care and proper assessment. #FeelGoodLiving #PharmacistPrescriber Vitamin B Injections: Fast Acting Energy, Nerve Health, Immune Boost Mountainside Medical 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 )