vitamin b12 injections uses Compounded B-Complex Injection B12 Shots at Home: How,
Description
Prevention or treatment of stress (caused by vaccination, diseases, transport, high humidity, high temperatures or extreme temperature changes)

After it's released into your system, B12 combines with another molecule called the intrinsic factor that aids its absorption into the small intestine

Rasmussen MH, Frystyk J, Andersen T, Breum L, Christiansen JS, Hilsted J
A- In some patients, it only takes a few weeks to notice an increase in energy levels and improvement in nerve symptoms, although a full cure can take much longer, depending on how bad the deficiency is and how compliant the patient is

www.karger.com, Shulpekova, Yulia O., et al

In vivo , Hong et al
