GHK Cu suppressed the activation of the p38 MAPK signaling pathway in Download Scientific Diagram The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu (Copper Peptide) isn't just another trend. It's a naturally occurring peptide in our bodies that plays a vital role in healing, collagen production, skin regeneration, and even hair support. Here's all GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes