Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum Just started GHK Cu? Here's what to expect This isn't an overnight peptide, it builds Weeks 12: You may start noticing small shiftsskin feels a bit smoother, nails a little stronger Weeks 34: Just started GHK Cu? Heres what to expect, This isnt an overnight peptide, it builds, Weeks 12:, You may start noticing small shiftsskin feels a bit smoother, nails a little stronger, Weeks 34:, Ever heard of GHK Cu peptide? It's a naturally occurring copper peptide that helps repair tissue, stimulate collagen, and support skin healing. When used in injectable form, it works at a deeper level