Hair Growth Cycle: The Circular Life & Death of Follicles The Science Behind Hairgenetix Copper Peptide Hair Growth Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides Peptides for Hair Loss: What Are They & Do They Work? Peptides are short chains of amino acids that act as cell signaling molecules. In hair care, certain peptides can help support Anagen and hair growth Insalaco Clinic Anagen phase: The growth phase of the hair cycle