Peptide Injection Site Reactions: What's Normal, What's Not, and What Revolution Health & Wellness BPC 157 Superior Peptide How necessary is the local injection site when adminstering BPC157 , In the video, I break down exactly how to use it and why both local and systemic injection can have benefits, Watch carefully Still injecting in the same spot every time? Read this. Where you inject your peptides can actually affect absorption, comfort, and results. Quick guide: Abdomen: fastest absorption Upper arms