GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia A GHK Cu face serum appears blue because the active ingredient, GHK Cu ( copper peptide), is naturally a blue colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue Copper Peptides: GHK Cu is your skin's built in botox Fatskn First time getting GHK Cu. Does this look ok? Not sure if this is how its supposed to look. : r PeptidePathways GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B