What Is GHK Cu? The Copper Peptide That Rejuvenates Skin Using GHK CU for Acne and Scarring Treatment GHK Cu (copper peptide) is a science backed anti aging compound that supports collagen production, skin regeneration, and overall skin health. Used in both topical serums and subcutaneous 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