how long does b12 injection stay in system Do Injections Last? Sublingual B12 vs. B12 Injections:

My energy is great also Ive been taking these for almost 4 weeks and have already lost 15 pounds

Obeid R, Fedosov SN, Nexo E

doi:10.1016/j.bmcl.2018.07.009

Neurological symptoms may start improving within 12 weeks, but longstanding complications can require 36 months of treatment, with some damage potentially irreversible

Many of our patients choose to inject once every 6 weeks however, further lowering the cost (usually the patient will feel when the effects are starting to wear off and choose that point to receive a further injection)

The injections are usually administered in areas with higher concentrations of fatty tissue, such as the arm, abdomen, thigh, or buttocks