Synergy of GHKCu and hyaluronic acid on collagen IV upregulation via fibroblast and exvivo skin tests Jiang 2023 Journal of Cosmetic Dermatology Wiley Online Library GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GlycyllhistidylllysineCu2+ rescues cigarette smokinginduced skeletal muscle dysfunction via a sirtuin 1dependent pathway Deng 2023 Journal of Cachexia, Sarcopenia and Muscle Wiley Online Library Intermediate Cu(II) Thiolate Species in the Reduction of Cu(II)GHK by Glutathione: A Handy Chelate for Biological Cu(II) Reduction Inorganic Chemistry