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 Growth Hormone and Aging Endotext NCBI Bookshelf GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? What is the safe topical dosing, duration, and contraindications for the copperbinding peptide GHKCu for wound healing or antiaging?
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ghk-cu plasma concentration age decline GHK-Cu Cooper Peptide: The Complete Skin & Repair Guide (2026)