Anybody experiment with GHK Cu peptide yet? Its supposed to help regulate your collagen production. Structure and gating mechanism of the 7 nicotinic acetylcholine receptor: Cell The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link GHK Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes