GHK Cu Peptide Benefits (And a Few Risks) Explained Parents & teen athletes: not everything trending on social media is safe. Copper peptides like GHK Cu are being promoted for skin health, but these products are unregulated and not FDA approved, which GHK Cu is one of the most talked about peptides in aesthetics right now. But how much of what you have heard about it is actually true? Copper peptide, known as GHK Cu, has GHK Cu is a naturally occurring copper binding peptide that plays a major role in tissue repair and remodeling, with a strong focus in research on skin and hair biology. It works by signaling