GHK Cu Peptide: Mechanism, Anti Aging Research, and Regenerative Benefits GHK Cu Copper Peptide Therapy for Hair & Skin in Mumbai 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 Essential GHK Cu Serum: What It Is, How It Works, and Why It Matters f Bacteriostaticwater.com