GHK Cu Peptide Therapy Collagen & Skin Renewal GHK Cu Hyaluronic Acid Gel Wells Pharmacy Network 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 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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ghk-cu plasma levels age decline 07 MARGOLINA/c_04 LORD_c