GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 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 Copper, Collagen, and Controversy: Inside the GHK Cu Buzz GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B