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 ) 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 ) B12 Shot Guide: Benefits, Dosage & Side Effects BodySpec Should You Use Sublingual B12 Over Capsules & Shots? What are the benefits of B12 injection? Blades Wellness