Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix 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 Copper Peptide Hair Growth Serum (GHK Cu & AHK Cu) Lets talk GHK Cu , GHK Cu is a naturally occurring copper peptide that supports:, Collagen production, Tissue repair, Skin rejuvenation, Reducing Inflammation , Healthy aging, As levels