Vitamin B12 Injections: Good or Bad? Staying healthy this time of year starts at the cellular level, and B12 plays a major role., Vitamin B12 supports energy production, nervous system function, red blood cell formation, and immune Energetic and lively with Vitamin B12 Depot Hevert 100 ampoules Magnesium vs. Vitamin B12: Which Nutrient Supports Your Energy Levels Better ? Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function.