It helps with DNA production, fatty acid synthesis, and energy
However, the swelling will still be quite pronounced for the first few days post-surgery
If BPC-157 was purchased today, the patent would likely expire in 2033 before the phase 1-2-3 trials would be completed, at which point all the generic manufacturers would be able to push the product on the back of all the hard work a pharmaceutical company can do (Im not sure if FDA approval would push the expiration of the patent back, but even then it would not be so financial lucrative)
The vitamin has gotten some buzz in the past decade or so after celebrities including Rita Ora, Justin Timberlake, and Madonna were reported to have tried injections to boost their B12 levels
Some NHS/ICB guidance notes oral options for dietary-related deficiency, and that long-term injection schedules depend on the cause