Hair Growth Serum Intense with Copper Peptide GHK Cu GHK Cu Isn't Just for Skin: The Anti Aging Peptide That Works From the Inside Out DUO Hair Growth Serum and Scalp Rejuvenation Fullscript GHK Cu Copper Peptide in LA 3,356+ Reviews GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not