The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline By age 30, your skin produces about 25% less collagen. By 40, that number can reach 40%. This decline affects more than just how your skin looks. It changes how it heals, The GH IGF 1 axis in obesity: pathophysiology and therapeutic considerations Nature Reviews Endocrinology HGH: THE IGF 1 INSULIN AXIS IS A TRUE DR. JEKYLL AND MR. HYDE ON ONES' HEALTH PUR FORM 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 A) Serum levels of growth hormone (GH) and (B) insulin like growth Download Scientific Diagram