Why Collagen Loss Accelerates After 40: The Role of GHK Cu in Menopaus Pure & Cimple GHK Cu Copper Peptide Injections: Advanced Skin Rejuvenation Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference What is GHK Cu and Why is Everyone Talking About It? GHK Cu (Copper Peptide) is a powerful, naturally occurring compound in the body that plays a key role in skin health