why vitamin b12 injections versus oral supplemnets gastric surgery How Much Should a Bariatric Patient Take? Vitamin B12 Injections vs. Oral

Nature 588 , 174179 (2020)

However, because the currently recommended dietary intake for vitamin B 12 in elderly people is low, dietary deficiencies are underdiagnosed

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Impairment of vitamin B 12 absorption can cause megaloblastic anemia and neurologic disorders in deficient subjects

"Oral Vitamin B12 Replacement for the Treatment of Pernicious Anemia"

Ilaria Tocco Tussardi of the Institute of Plastic Surgery at University Hospital of Padova in Italy