It's like bending a paperclip back and forth until it breaks
Your responsibility is to understand YOUR body, YOUR goals, and YOUR risk tolerance, and then work with qualified practitioners who understand these compounds at a mechanistic level
Specifically, a review of clinical trials on the use of BPC-157 has characterized it as safe both in treating inflammatory bowel disease and wound healing, noting that no events of toxicity had been reported throughout those trials.
Additionally, older adults who naturally have a more challenging time absorbing vitamin B12 or those on certain medications that affect B12 absorption may be ideal candidates
It's not always the case, but I would have expected something as well as an unmeasurable B12
Awareness of these pitfalls improves success rates