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 glycyl l histidyl l lysine Cu2+ tripeptide complex attenuates lung inflammation and fibrosis in silicosis by targeting peroxiredoxin 6 ScienceDirect 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, Growth hormone releasing hormone disruption extends lifespan and regulates response to caloric restriction in mice eLife The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget The GHK Cu delays aging in Caenorhabditis elegans via coordinated regulation of mitochondrial function and activation of DAF 16 SKN 1 pathways Biogerontology Springer Nature Link