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While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient
There isnt a standard number attributable to the injection itself
Differentiating from Other Conditions Neurological signs and symptoms can be vitamin B12 deficiency associated or due to other causes such as: Pernicious anemia Syphilis Neurosyphilis Human immunodeficiency virus (HIV)-associated vacuolar myelopathy Toxic neuropathies Tropical myeloneuropathy Your healthcare provider can make a proper diagnosis based on your symptoms, medical history, physical exam, and laboratory test findings
GLP-1RA-induced delays in gastrointestinal motility: Predicted effects on coadministered drug absorption by PBPK analysis
