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 Peptide Progress: Week 3 Results Insulin like growth factor 1 level is a poor diagnostic indicator of growth hormone deficiency Scientific Reports Figure 1 from Intranasal Human Growth Hormone (hGH) Induces IGF 1 Levels Comparable With Subcutaneous Injection With Lower Systemic Exposure to hGH in Healthy Volunteers Semantic Scholar Frontiers Growth hormone insulin like growth factor I axis in health and disease states: an update on the role of intra portal insulin Copper peptide GHK Cu Wikipedia