Product Details 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 GHK Cu Peptide Serum: Copper Peptides for Skin Firmness Mythos Mythos Skincare Glow from within with GHK Cu Copper Peptide This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support fuller, healthier looking hair from the