The form of GHK Cu you use may matter more than the peptide itself. Which form of GHK Cu have you personally tried before and what was the FIRST noticeable change you experienced? The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget Exploring the Role of Tripeptides in Wound Healing and Skin Regeneration: A Comprehensive Review GHK Cu Peptide: Beginner's Guide to Potential Benefits GHK Cu GHK cu Copper Peptide: The "Glow" for Hair & Skin Seenergie PH