The AAFPs evidence-based clinical review states directly: Oral administration of high-dose vitamin B12 (1 to 2 mg daily) is as effective as intramuscular administration for correcting anemia and neurologic symptoms in patients with B12 deficiency (Langan RC, Goodbred AJ, American Family Physician, 2017)
nevertheless, human trials are currently absent to verify whether the same advantages manifest outside of laboratory conditions
As this study involved secondary analyses of de-identified data, it is classified as research not involving human subjects under current regulatory guidelines
Your provider may ask you to remain seated for 5 to 10 minutes afterward as a precautionary observation period, particularly if it is your first injection
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The autonomic aspects of the post-COVID19 syndrome