The Science Behind Hairgenetix Copper Peptide Hair Growth Anagen and hair growth Insalaco Clinic 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 phase: The growth phase of the hair cycle Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides