The GH IGF 1 axis in ageing and longevity Nature Reviews Endocrinology The GH IGF 1 axis in obesity: pathophysiology and therapeutic considerations Nature Reviews Endocrinology 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 GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Pediatric Implications of Normal Insulin GH IGF Axis Physiology Endotext NCBI Bookshelf