Shoulder - make a downward-facing triangle over the deltoid muscle on the upper arm with the thumb and forefinger of the non-injection hand
In powder form, however, the B12 can last for years
Options for managing tolerance include a brief dose reduction for 4 to 8 weeks ("drug holiday" at a lower dose, not complete cessation), lifestyle optimization to maximize the medication effect, evaluation for other contributing factors (thyroid function, cortisol, sleep quality, medication interactions), and consideration of adding a complementary compound to address specific aspects of the plateau
Include electrolytes (sodium, potassium, magnesium) if you are eating significantly less than usual, as reduced food intake also means reduced electrolyte intake
B12 injections are elective wellness services
Deficiency can also be caused by poor absorption