Role of IGF 1 in the Growth Hormone IGF Axis Frontiers Growth Hormone and Insulin Like Growth Factor Action in Reproductive Tissues The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu 50mg Particle Peptides GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference