how fast do b12 injections work for Energy: they work? How Quickly Does B12 Shot

However, the top two ranked administration routes were the oral route (78.3) and the IM route (49.6)

With 30,000 mcg per vial (30 mL, 1,000 mcg/mL), this versatile multiple-dose formula is expertly crafted for maximum absorption and effectiveness

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Patients were being told by the GPs that following the BSH Guidance they have enough B12 stored in their liver and won't need an injection for a long time.

Li X, et al