Can GHK Cu Copper Peptide Tighten Skin After Weight Loss? Loose skin isnt about age alone., Its about collagen signaling., GHK Cu (copper peptide) is known for supporting pathways involved in:, Collagen and elastin production, Skin remodeling and 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 7% GHK CU ACCELERANT Shed Copper Peptide Hair Growth Serum Take an Rx approach to hair health