Bounce Back Better with Peptides for Injury Recovery GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Subcutaneous Injection Sites and Instructions for Safe Self Administration 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 Top 3 Areas to Use GHK CU Effectively TikTok