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allergic reaction b12 injection MIC Side Effects: Safety & Clinical Overview – PlexusDx Why Do I Feel Worse
Description
While this is a real concern for the patient, the GPs decision is based on the established clinical effectiveness of the injection schedule

The vitamin is injected deep into the muscle, where it can slowly release into your bloodstream

Do not assign both without clear documentation of co-existing distinct conditions
2011 Jan;96(1):150-8

Additionally, it is one of the nine essential amino acids in the human body
