Cellular Glow Advanced Regenerative Skincare with GHK Cu GHK Cu 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 GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu Peptides Benefits for Anti Aging Skin Rejuvenation How to Use With Micro Infusion