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BPC-157, like all peptides used for these purposes, is in a regulatory questionable zone

For localized injury, BPC-157 is often injected SubQ near the injury site

In contrast, the bulkier Y37 rAmy in rAmy-bound AMY 2 R prevents equivalent interactions of N35 rAmy with RAMP2, and instead the bulkier Y37 rAmy forms interactions with E101 RAMP2 and F111 RAMP2 stabilising the peptide at the CTR/RAMP ECD interface in the bypass conformation

The needle tips also dull and burr after first use, increasing tissue trauma at the same depth

Pharmacopuncture 11 (1), 4154

Those taking proton pump inhibitors might also have trouble absorbing it