GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Peptide Forum Science Based Peptide Research Discussion Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms