Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg B12 Injections Regen Doctors B12 vitamin Store A Retired RN About Vitamin B12 Injections Vitamin B12 Injections (Cyanocobalamin Injections) Mountainside Medical Feeling low on energy? Your body might be telling you something. Vitamin B12 is essential for energy, mood, and brain function. If you're experiencing fatigue, weakness, or brain fog, a B12 injection