GHK Cu Peptide Regenerative & Cosmetic Research GHK CU 100mg Cellgenic 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 is not Botox. It does not freeze a single muscle. It works because it works at the matrix level. GHK Cu stimulates collagen and glycosaminoglycan synthesis, modulates the matrix metalloproteinases that govern GHK Cu Peptide The benefits, side effects, and more [2026] GHK Cu Glow Peptide Stack for Skin Rejuvenation Jennifer R. Berman MD