GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu is one of the most powerful regenerative peptides for skin, hair, and overall tissue health. GHK Cu supports collagen production, healing, and visible rejuvenation from within. It's commonly used to improve skin What Is GHK Cu? Discovery & Research Honest Peptide 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 Youthful Skin, Healthy Cells, Vibrant You. GHK Cu Topical Spray Wells Pharmacy Network