GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic The GH IGF 1 axis in ageing and longevity Nature Reviews Endocrinology Pharmacogenomics of insulin like growth factor I generation during GH treatment in children with GH deficiency or Turner syndrome The Pharmacogenomics Journal GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B How GHK Peptide Works Signaling GHK acts as a switch for skin repair: Interacts with adenosine receptors reduces inflammation Activates MAPK ERK, PI3K Akt, TGF pathways Stimulates fibroblasts & keratinocytes boosts collagen, elastin Pediatric Implications of Normal Insulin GH IGF Axis Physiology Endotext NCBI Bookshelf