How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust How to Give a B12 Injection: Step By Step Instructions 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 B12 Shots: Benefits, Uses, Safety, Cost & How They Work What Happens If You Inject B12 Wrong: 6 Red Flags How Quickly Does B12 Shot Work? Does It Help to Lose Weight?