Peptide Injections: The Future of Health and Wellness Subcutaneous Injection Sites and Instructions for Safe Self Administration DSIP Elive Health & Wellness 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