As researchers from Cornell University Medicine stated, Management requires correctly diagnosing cobalamin deficiency, reversing it, defining its underlying causes, preventing relapse, managing the underlying disorder and its complications, and educating the patient. Do You Need B12 Injections
J Transl Med 12:32 Sharma Y, Sumanadasa S, Shahi R, Thompson C (2024) Role of vitamin C in treatment of community-acquired pneumonia in adult patients requiring hospitalisation: a systematic review protocol
Not intended to diagnose, treat, cure or prevent any disease
If youre vegan or mostly plant-based, oral or sublingual B12 is usually enough long term shots are typically for documented deficiency or absorption issues (NIH ODS)