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 Unlocking the Secrets of GHK Cu: The Revolutionary Peptide for Youthfu The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Effects of Copper Tripeptide on the Growth and Expression of Growth Factors by Normal and Irradiated Fibroblasts Jeffrey D. Pollard, Susan Quan, Thomas Kang, R. James Koch, 2005
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