Advanced GHK Cu Neck & Face Serum Premium Quality Neurogan Health 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 By age 30, your skin produces about 25% less collagen. By 40, that number can reach 40%. This decline affects more than just how your skin looks. It changes how it heals, The potential of GHK as an anti aging peptide Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms By age 30, your skin produces about 25% less collagen. By 40, that number can reach 40%. This decline affects more than just how your skin looks. It changes how it heals,