ReMed HydraPen (GHK Cu) Bltt kobberpeptidserum (2x5 ml) FillerDepot GHK Cu: Effective Anti Aging Skincare Ingredient Nugenyx 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 Did you know that GHK Cu is a natural naturally occurring copper complex in the body that decreases with age? Benefits of GHK Cu Reverses thinning tightens loose skin Improves firmness, elasticity,