Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin Does GHK Cu Really Work? 40 Years of Research Reviewed Effects of Copper Tripeptide on the Growth and Expression of Growth Factors by Normal and Irradiated Fibroblasts Jeffrey D. Pollard, Susan Quan, Thomas Kang, R. James Koch, 2005 Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips