GHK Cu: My secret weapon for skin, hair, and healing, I use it two ways topical cream for my face, and subQ injections 3x a week., It boosts collagen, tightens skin, helps hair grow, and even dAnTeS tAKiNg StErOiDs , GHK Cu is a copper peptide commonly discussed for skin health, recovery, and collagen support. If youre gonna look into peptides, learn first, rush never. Too many GHK Cu Copper Peptide: The Ultimate Peptide For Longevity GHK Cu Peptide Progress: Week 3 Results