GHK Cu Peptide Therapy Collagen & Skin Renewal The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 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 Copper Peptide Regenerating Serum for Glowing Skin and Hair What is GHK Cu? LIVV GHKCU Peptide Therapy Relive Health Houston, TX