GHK Cu is a powerful copper peptide that supports collagen production, skin and hair health, and tissue repair. It may help reduce fine lines, improve elasticity, and promote faster healing. Want to learn GHK Cu Peptide (50mg) Advanced Skin Rejuvenation & Healing Support 5 things that might surprise you about GHK Cu 1 Your body already makes it. GHK Cu is a naturally occurring copper peptide found in plasma, saliva, and urinebut levels decline as we age. A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend