Everyone's calling GHK Cu a miracle peptide But let's separate marketing from mechanism. GHK Cu isn't magic. It's a signal. A signal that: Supports tissue repair Modulates inflammation Enhances collagen + Insulin like growth factor 1 (IGF 1) and growth hormone (GH) in immunity and inflammation ScienceDirect IGF 1 promotes the development and cytotoxic activity of human NK cells Nature Communications Is Growth Hormone Resistance IGF 1 Reduction Good for You?: Cell Metabolism Frontiers A Balanced Act: The Effects of GHGHRIGF1 Axis on Mitochondrial Function The GH IGF 1 axis in ageing and longevity Nature Reviews Endocrinology