GHK Cu Peptide: Benefits, Uses and Dosage My 90 Day Beard Growth Protocol Using Minoxidil and GHK Cu Peptides (With Progress Pics) : r BioHackingGuide GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping GHK Cu Beard Growth Serum: Fast Results, No Minoxidil