Should You Take Natural vs. Synthetic B12? Vitamin B12 IM Injectable at Philly IV Lounge Benefits of B12 Injections: Boosts energy levels & reduces fatigue Supports brain function & mental clarity Helps produce red blood cells Supports metabolism & overall wellness 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 )