GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect 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 GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper