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The correct comparison is therefore which route fits this diagnosis and treatment plan? rather than which product gives the biggest or fastest boost? Why testing and individual assessment matter Tiredness, poor concentration, low mood, pins and needles and weakness can occur with vitamin B12 deficiency, but they also have many other possible causes
Side effects might include pain, redness, or swelling where the shot was given
Route of Administration: Given through IV (intravenous) or IM (intramuscular) injection Methylcobalamin Injection (B12) FAQs Doctors may stop B12 injections if a patients levels are stabilized, if they switch to oral supplements, or if there's no clear deficiency
That can be appropriate, but it is important not to assume that all fatigue is caused by B12 deficiency