AHK Cu vs GHK Cu Difference Between GHK Cu and AHK Cu So excited about this peptide! GHK Cu serum and scalp solution available Fascinating peptide that helps to prevent and reduce fine lines and wrinkles. Applied topically on the scalp for hair growth. 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: GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia PDF) The effect of tripeptide copper complex on human hair growth in vitro