how is vit b12 injection administered Treating Severe Vitamin Deficiency B12 Shots vs. IV Infusions:

Is it really an inconvenience to the patient to have a life-saving injection at the correct frequency for them

One thing I'd like to mention is possible issues with histamine or even mast cell activation

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(Source) When this enzyme is present in great concentration within fat cells and is highly expressed, obesity is inevitable: In the study by Kannt and colleagues, NNMT expression is increased ~2-fold in subcutaneous and omental adipose tissue of type 2 diabetic subjects (men and women), compared to healthy controls Importantly, interventions that increase insulin sensitivity, such as exercise and bariatric surgery, also decreased expression of NNMT in adipose tissue For this reason alone, scientists have been interested in every possible method for inhibiting NNMT expression: We report that NNMT expression is increased in [white adipose tissue (WAT)] and liver of obese and diabetic mice