Nurturing Your Locks: Mastering the Hair Growth Cycle Clinikally 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 Anagen phase: The growth phase of the hair cycle The Hair Growth Cycle: Understanding the 4 Stages GHK Biotin Peptide for Hair Growth: The Science Behind Scalp Renewal I'm Fabulous Cosmetics Understanding Hair's Natural Life Cycle: Anagen, Catagen, Telogen Zenagen