Copper Peptide Regenerating Serum for Glowing Skin and Hair Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds,