Oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less in people with low intrinsic factor, atrophic gastritis, or gut absorption issues
So the common question, "how many pills equal one shot," does not have a clean answer
Patients with pre-existing conditions including cardiovascular disease, liver disease, thyroid disorders, kidney disease, or gallbladder disease face particular uncertainty
doi:10.1186/s12944-018-0779-4
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Depending on the reason it's being prescribed, it can be anywhere from daily to every three days to once a month