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 Supplementation: Oral Capsules vs. Sublingual Tablets AZ Dietitians B12 Shots Do You Need a Prescription? A Complete Guide Carter's Walk In + Urgent Care B12 Injections vs. Oral Supplements: Which Is Better? B12 Injections vs Pills Baltimore: Which Works? PDF) Comparison of sublingual vs. intramuscular administration of vitamin B12 for the treatment of patients with vitamin B12 deficiency