B 12 (Cyanocobalamin) Shot Therapy MedClub by Dr Jenn 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. Vitamin B 12 Cyanocobalamin 1,000 mcg mL Intramuscular or Subcutaneous Injection Multiple Dose Vial 30 mL CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL