GHK Cu and Gray Hair: Can the Copper Peptide Reverse or Prevent Graying? Age Proof Performance So Just another person reversing in age. The GHK COPPER Peptide is known, since 1973, to thicken hair follicles, increase the number of follicles and to reverse the changes in color where hair This peptide reverses aging, And its been hiding in plain sight for decades., GHK Cu (Copper Peptide) is one of the most researched anti aging ingredients out there., Heres what it does:, So Just another person reversing in age. The GHK COPPER Peptide is known, since 1973, to thicken hair follicles, increase the number of follicles and to reverse the changes in color where hair