The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Little peptide, but a BIG job! GHK Cu is a naturally occurring copper peptide that gets a lot of attention in research because it's been reported to influence thousands of genes tied to Viral claim says GHK Cu reset nearly 4,000 genes to a younger state and increased collagen production in a preclinical study. This refers to research on GHK Cu, a naturally occurring copper binding peptide that GHK Peptides: The Rising Star in Longevity and Skin Health Matakana Pharmacy Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol