My Sunday facial before and after..After 18 KLOW injections. I can't get enough of the science behind this!! The peptides I use test at 99% purity. That is as high as a 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 Benefits of Peptides for Skin The Beauty & Wellness Collective Subcutaneous Injection Sites and Instructions for Safe Self Administration Peptide Therapy for Pain Management and Healing Core Medical & Wellness