GHK Cu is a naturally occurring tripeptide in human plasma. Levels average 200 ng ml at age 20 and drop to 80 ng ml by age 60 (Pickart et al., 2020). That decline tracks with GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 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 PDF) The Effect of the Human Plasma Molecule GHK Cu on Stem Cell Actions and Expression of Relevant Genes Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow
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ghk-cu plasma concentration age decline The naturally occurring peptide GHK reverses age-related fibrosis by modulating myofibroblast function | He