A vitamin B12 injection is a shot that delivers B12 directly into your muscle, helping your body absorb it quickly (especially if your body struggles to absorb it from food or tablets) How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 Are you feeling run down? Low Energy? A quick Vitamin B12 injection can help support energy, metabolism, and overall wellness. It delivers the vitamin directly into the muscle, allowing your body to Ivy Grove Surgery : Self administration of B12 injection