Where you inject peptides matters more than most people think. Proper site rotation helps prevent irritation, lumps, and poor absorption while keeping your treatment effective. Learn the safest injection sites and how 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 Introduction to Peptide Therapies Dr. Padra Nourparvar Stem Cell & PRP Institute of L.A. DSIP Elive Health & Wellness