b12 injection sc or im Best Vitamin Injections for Managing Vitamin B12 Deficiency Symptoms — Mountainside Medical Where to Inject Vitamin B12

It may be difficult to determine the exact time when your vitamin B12 injections have started working, as many people will report noticing a difference in their energy levels within a few days following the shot, and others may not feel the increase in energy for multiple weeks if their body needs the vitamin to build up a bit more

Exploring B12 Shots & Injections: The Good, Bad, and Alternative

Learn How An easy to follow step-by-step for intramuscular injections can be found on our How to Perform an Intramuscular Injection of Vitamin B12 page

[2] Pharmacokinetic studies demonstrate rapid systemic distribution with peak plasma levels occurring within 30-60 minutes of intramuscular injection, followed by extensive hepatic storage and enterohepatic recycling