how quickly do b12 injections work Does a Shot Work? What to Expect How Fast Does a Vitamin

The reaction is thought to occur due to impurities in the B12 injection, notes Drugs.com

It is essential for DNA repair, cellular survival, and energy metabolism

200,000IU Component Cholecalciferol (EP) in 1mL ----5mg (200,000 IU) [Solvent: medium-chain triglycerides (MCTs), Tocopherol(dl--Tocopherol)] Identification Colorless to greenish-yellow cholecalciferol emulsion in a brown glass ampoule Efficacy / Effect 1

Let's walk through this step by step, just as I would if I were sitting beside you for your first injection

Further, NICE and the BNF says that if there are neurological symptoms present, then every other day injections are the recommended treatment, so all the points you make about B12 being stored and sufficient are not really relevant