Subcutaneous Injection: What It Is and How to Give One BPC 157 Oral vs Injection: Which Form Works Best for Healing? Oral vs Injectable BPC 157: Differences, Benefits, and When to Use Eac Revolution Health & Wellness 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