what happens if you inject too much b12 Vitamin Injection Side Effects and Safety How Quickly Does B12 Shot
Description
The appeal is understandable who wouldnt want faster healing and better muscle tone

Dose frequency should relate to the severity of the deficiency
"Systematic review and pragmatic clinical approach to oral and nasal vitamin B12 (cobalamin) treatment in patients with vitamin B12 deficiency related to gastrointestinal disorders"

it's more like a slow fade that you might not even notice until someone points out that you seem tired all the time