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 GHK Copper Peptide GHK Cu Tripeptide 1 Glow Peptide AH Clinics You don't have to keep hiding your edges, filling in thinning spots, or wondering what happened to your hair. If you're dealing with postpartum shedding, hormonal imbalances, stress related hair loss, breakage, thinning