GHK Cu Topical vs Injection Which is the Better Copper Peptide Form? A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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 Not ready for injectable peptides? The topical GHK Cu is still a vibe If youve been wanting healthier looking, glowy, hydrated skin while aging gracefully this might be your sign to tap in