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)
Since peptides' oral bioavailability is usually limited, they are often administered by injection into subcutaneous fat (as around the belly, thighs, or upper arms).24 TB4 or TB-500 injections are typically administered once per day, at any time of day, five days per week
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By adjusting the dosage based on individual needs, doctors can help patients with vitamin B12 deficiency get the best results
M.et al (2009)