too much vitamin b12 injections Feeling worse after Injection: Answering concerns b12 methylcobalamin injection Sandoz Vitamin
Description
That does not mean it is ineffective for the right patient

A switch to the new CPT codes that are already defined will be coming most likely in 2018

Depending on the individual, they start working within 48 to 72 hours of the first dose, but they might take three months to completely correct a B12 deficiency

Research Square Preprint
B12 injections are safe and effective when administered appropriately

Initially focused on metabolism, research showed NNMT elevation with age/weight leads to fat accumulation, inefficiency, and NAD+ loss.[30][31] High NNMT correlates with insulin resistance and obesity in humans
