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That structural feature is significant: proline residues resist proteolytic cleavage, making the peptide unusually stable in gastric conditions relative to most short peptides [1]

Any assertion to the contrary is not supported by evidence It IS fair to say that there is no clear evidence of harm in a relatively data free zone in humans, and that there is a plausible argument for benefit based upon in vitro and animal studies as well as mechanism of action - particularly with BPC

For anyone running peer-reviewed or grant-funded research, that documentation is the baseline

B12 injections are often recommended for individuals who have trouble absorbing this vitamin from food or supplements due to various medical conditions or dietary restrictions

In short: B12 shots are used because they deliver vitamin B12 faster, more reliably, and more efficiently than oral supplements, especially if you have an absorption issue