b12 injection intramuscular How to Inject Vitamin B12 Shots vs. IV Infusions:

Being aware of how your cycle overlays symptom changes can be important in untangling the various impacts on your mood and in understanding how well different treatments are working

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B12 is responsible for the uptake of iron and the production of red blood cells, nerves, DNA, and an amino acid that affects mood and the immune system

In one of his dear doctor letters, he writes that there is no proof that intramuscular B12 injections are better than oral tablets, so stop treating people with B12 injections

This should only be used if the patient has been confirmed to have had inadequate responses to other forms of treatment