bpc-157 clinical evidence human trials safety and the Difference Between an Gap and a Cover-Up: What the entire evidence base actually looks like, and the questions to ask next. — WellFounded BPC-157 vs TB-500: Complete Comparison
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This is a theoretical risk, not a demonstrated one, and it should factor into who avoids this stack (see below)

[63:37] Andrew Huberman Do they get absorbed

After washing to remove unbound components, an enzyme-conjugated anti-TSH antibody was introduced, forming a sandwich with the captured TSH

Ohio State research as well as other studies have shown that newly weaned pigs cannot efficiently utilize stabilized feed-source vitamin E ester (Figure 1), however they are able to utilize d-alpha-tocopherol the same form of vitamin E found in milk and grass (Figure 2)
ALLERGY TO VITAMIN B12 Allergic reactions could be another reason why you feel worse after B12 injections