Is intramuscular (IM) administration of vitamin B12 injections preferred over subcutaneous (SC) administration? Cyanocobalamin Injection: Vitamin B12 Deficiency Relief Mountainside Medical Cyanocobalamin Injection, USP 1000 mcg mL Vitruvias Therapeutics Needle Injection Techniques Every Nurse Should Know! Whether you're prepping for your NCLEX or brushing up on your skills, here's a quick breakdown of the most common injection routes you'll encounter B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements.