# GHK-Cu References: The Cited Research Record

> GHK-Cu references: the full cited source list behind this digest — PubMed, PMC, DOIs and journal citations for every quantitative claim about the copper tripeptide.

Every quantitative claim in this digest maps to a numbered source below. Primary literature and reviews, with DOIs and PubMed or PMC links.

## How to read this list

These GHK-Cu references are the full source set behind the digest. Each inline marker — [1], [2], and so on — corresponds to the numbered entry here. Identifiers (DOI, PMID, PMC) are given so any claim can be traced to its source. Every quantitative statement on this site — every dose, percentage, molecular weight and effect size — maps to one of these entries.

The record is weighted toward in vitro and rodent work plus a set of reviews, several from one investigator group (Loren Pickart and colleagues, 1938-2023). That concentration of authorship is itself worth noting when weighing the broad gene-expression and systemic anti-aging claims, which await wider independent replication. Independent contributions — the COPD lung-fibroblast gene-signature study from Campbell and colleagues, the Ladiges-group anti-aging and fibrosis work, the human skin-penetration study, and the 45-man hair-loss trial — are noted in the research pages where they appear, and they carry the strongest external corroboration.

Two cautions run through the citations. Where a study used the free peptide GHK or an analog such as AHK-Cu rather than the GHK-Cu copper chelate, that distinction is flagged in the text, because copper coordination is required for most of the documented matrix activity [1]. And the most recent anchors — a 2025 anti-wrinkle review and a 2024 fibrosis study — are included as the freshest synthesis of an otherwise mature literature [15][16].

The sources fall into a few groups. Primary mechanistic studies establish the core findings: the 1988 fibroblast collagen experiment [1], the human skin-penetration measurement [5], and the hair-growth trial [4]. Reviews consolidate the wider picture — tissue remodeling [6], skin regeneration [3], the gene-expression signature [2] and the anti-aging case [7]. Tissue-engineering and delivery papers cover hydrogels, scaffolds and liposomes [9][10][13]. Reading any claim back to its group is the fastest way to judge how much weight it can bear.

## References

[1] Maquart FX, Pickart L, Laurent M, Gillery P, Monboisse JC, Borel JP. Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+. FEBS Lett. 1988;238(2):343-346. https://pubmed.ncbi.nlm.nih.gov/3169264/
[2] Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci. 2018;19(7):1987. https://pmc.ncbi.nlm.nih.gov/articles/PMC6073405/
[3] Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108. https://pmc.ncbi.nlm.nih.gov/articles/PMC4508379/
[4] Lee WJ, Sim HB, Jang YH, Lee SJ, Kim DW, Yim SH. Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth. Ann Dermatol. 2016;28(4):438-443. https://pmc.ncbi.nlm.nih.gov/articles/PMC4969472/
[5] Hostynek JJ, Dreher F, Maibach HI. Human skin penetration of a copper tripeptide in vitro as a function of skin layer. Inflamm Res. 2011;60(1):79-86. https://pmc.ncbi.nlm.nih.gov/articles/PMC3016279/
[6] Pickart L. The human tri-peptide GHK and tissue remodeling. J Biomater Sci Polym Ed. 2008;19(8):969-988. https://pubmed.ncbi.nlm.nih.gov/18644225/
[7] Dou Y, Lee A, Zhu L, Morton J, Ladiges W. The potential of GHK as an anti-aging peptide. Aging Pathobiol Ther. 2020;2(1):58-61. https://pmc.ncbi.nlm.nih.gov/articles/PMC8789089/
[8] Campbell JD, McDonough JE, Zeskind JE, et al. A gene expression signature of emphysema-related lung destruction and its reversal by the tripeptide GHK. Genome Med. 2012;4(8):67. https://pmc.ncbi.nlm.nih.gov/articles/PMC4064320/
[9] Jose S, Hughbanks ML, Binder BYK, Ingavle GC, Leach JK. Enhanced trophic factor secretion by mesenchymal stem/stromal cells with Glycine-Histidine-Lysine (GHK)-modified alginate hydrogels. Acta Biomater. 2014;10(5):1955-1964. https://pmc.ncbi.nlm.nih.gov/articles/PMC3976757/
[10] Molavi AM, Sadeghi-Avalshahr A, Nokhasteh S, Naderi-Meshkin H. Enhanced biological properties of collagen/chitosan-coated poly(epsilon-caprolactone) scaffold by surface modification with GHK-Cu peptide and 58S bioglass. Prog Biomater. 2020;9(1-2):71-82. https://pmc.ncbi.nlm.nih.gov/articles/PMC7289912/
[11] Pyo HK, Yoo HG, Won CH, Lee SH, Kang YJ, Eun HC, Cho KH, Kim KH. The effect of tripeptide-copper complex on human hair growth in vitro. Arch Pharm Res. 2007;30(7):834-839. https://pubmed.ncbi.nlm.nih.gov/17703734/
[12] Tosto R, Vecchio G, Bellia F. New Biotinylated GHK and Related Copper(II) Complex: Antioxidant and Antiglycant Properties In Vitro against Neurodegenerative Disorders. Molecules. 2023;28(18):6724. https://pubmed.ncbi.nlm.nih.gov/37764500/
[13] Dymek M, Olechowska K, Hac-Wydro K, Sikora E. Liposomes as Carriers of GHK-Cu Tripeptide for Cosmetic Application. Pharmaceutics. 2023;15(10):2485. https://pmc.ncbi.nlm.nih.gov/articles/PMC10610410/
[14] Loren Pickart, isolation of GHK as a plasma factor (1973); plasma GHK declines from ~200 ng/mL at age 20 to ~80 ng/mL by age 60, as reviewed in Pickart & Margolina 2018 and Pickart et al. 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC6073405/
[15] Mortazavi SM, Mohammadi Vadoud SA, Moghimi HR. Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective. BioImpacts. 2025;15:30071. https://pmc.ncbi.nlm.nih.gov/articles/PMC11830136/
[16] He Q, Mazzola J, Ladiges W. The naturally occurring peptide GHK reverses age-related fibrosis by modulating myofibroblast function. Aging Pathobiol Ther. 2024. https://pmc.ncbi.nlm.nih.gov/articles/PMC12352503/

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An instrument-panel readout of the published GHK-Cu record — every datum logged to its source, no clinic behind the signal and nothing on this panel for sale.