B12 Shots vs. IV Infusions: What is the difference? Integrative Medicine, Laser and Aesthetics 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 B12 INJECTION 3000 mcg Vitamin B12: Injection vs Tablets, Vitamin B12 Tablets ?, Mild deficiency, Digestion , Long term maintenance, Vegetarians (regular use), Pros:, Easy to take, Affordable, Should You Use Sublingual B12 Over Capsules & Shots? Still taking vitamin B12 injections? Move over shot. A pill may be just as good. Dr. Leslie Greenberg's Blog