Subcutaneous Injection: What It Is and How to Give One I spent 4 months reporting on the peptide BPC 157 and its unlikely journey from a research lab in post communist Croatia to today's MAHA movement. Ask me anything. : r IAmA BPC 157 has already hit the mainstream, but should it hit your bloodstream? Subcutaneous Injection Sites and Instructions for Safe Self Administration What is BPC 157 (Body Protection Compound 157) and how is it administered therapeutically?