Understanding Hair Growth Cycle and Hair Loss Causes TikTok Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum 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 Cellular Glow Hair Serum 10% GHK Cu + 5% AHK Cu Peptides Hair Growth Phases Explained: How Your Hair Naturally Cycles Hairy Hair