Most people think skincare works at the surface level. But healthy skin function starts much deeper than a temporary glow. GHK Cu is a naturally occurring copper binding tripeptide that is already found Peptide Labz Copper Peptide Hair Growth Serum, 10% GHK cu, 5% AHK cu, Rejuvenates Follicles Walmart.com Best Copper Peptide Serum The top 4 options of 2026 Meet the peptide your skin has been waiting for Studies show that GHK Cu is known for stimulating collagen, improving skin quality, and supporting true cellular regeneration working beneath the surface