B12 injections have been high on my list, and I finally took the plunge today! Better absorption is just one of the perks, as it bypasses the stomach. Bloodwork is typically not B12 Injections for Energy: Benefits and How It Works AZ IV Medics B12 Injection Demonstration into the Abdomen YouTube 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. How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust