Most people think skincare works at the surface level. But healthy skin function starts much deeper than a temporary glow. GHK Cu is a naturally occurring copper binding tripeptide that is already found GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides Copper, Collagen, and Controversy: Inside the GHK Cu Buzz GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective?