Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum 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 The Power of GHK Cu: The Youth Peptide You Need to Know About Did you know there's a peptide that's been shown to stimulate collagen, repair tissue, and restore your skin's GHK Cu Peptide The benefits, side effects, and more [2026]