# GHK-Cu References: The Cited Source Record for This Ledger

> The full GHK-Cu reference list behind this site — every collagen, skin, hair-growth and pharmacokinetic claim resolved to its PubMed, PMC and DOI source, dated and verifiable.

Every quantitative claim on this site resolves to one of the entries below — author, journal, year, PMID and DOI — so any line item can be verified at its source.

## How to read this reference list

Every GHK-Cu reference behind this site is listed below with its full citation, PubMed or PMC URL and DOI, numbered to match the inline markers used across the research, skin, serum, dosage and FAQ pages. The list is the audited backbone of the ledger: if a number appears in the text, its source is here, and each entry is dated so the age of the evidence is visible. The record runs from the 1988 fibroblast collagen dose-response [1] to the 2024 ionic-liquid-microemulsion hair study [12] and the 2025 anti-wrinkle delivery review [11].

Two cautions belong with the list. A large share of the foundational mechanistic and review literature — including the gene-expression and skin-regeneration reviews [2][3][6] — originates from a single investigator group (Loren Pickart and colleagues), so independent replication of the broader claims is limited. And several entries are in-vitro or rodent studies; the evidence grade is noted in the body text where each is cited, not flattened into a single confidence level. The full citations follow.

## 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] 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/
[8] Jiang F, Wu Y, Liu Z, Hong M, Huang Y. Synergy of GHK-Cu and hyaluronic acid on collagen IV upregulation via fibroblast and ex-vivo skin tests. J Cosmet Dermatol. 2023;22(9):2598-2604. https://pubmed.ncbi.nlm.nih.gov/37062921/
[9] 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/
[10] Endo T, Miyagi M, Ujiie A. Simultaneous determination of glycyl-L-histidyl-L-lysine and its metabolite, L-histidyl-L-lysine, in rat plasma by high-performance liquid chromatography with post-column derivatization. J Chromatogr B Biomed Sci Appl. 1997;692(1):37-42. https://pubmed.ncbi.nlm.nih.gov/9187381/
[11] 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/
[12] Liu T, Liu Y, Zhao X, Zhang L, Wang W, Bai D, Liao Y, Wang Z, Wang M, Zhang J. Thermodynamically stable ionic liquid microemulsions pioneer pathways for topical delivery and peptide application. Bioact Mater. 2024;33:1-18. https://pmc.ncbi.nlm.nih.gov/articles/PMC10643103/
[13] Arul V, Kartha R, Jayakumar R. Biotinylated GHK peptide incorporated collagenous matrix: A novel biomaterial for dermal wound healing in rats. J Biomed Mater Res B Appl Biomater. 2005;73(2):383-391. https://pubmed.ncbi.nlm.nih.gov/15803494/
[14] Bobyntsev II, Chernysheva OI, Dolgintsev ME, Smakhtin MY, Belykh AE. Anxiolytic effects of Gly-His-Lys peptide and its analogs. Bull Exp Biol Med. 2015;158(6):726-728. https://pubmed.ncbi.nlm.nih.gov/25900608/
[15] Sever'yanova LA, Dolgintsev ME. Effects of Tripeptide Gly-His-Lys in Pain-Induced Aggressive-Defensive Behavior in Rats. Bull Exp Biol Med. 2017;164(2):140-143. https://pubmed.ncbi.nlm.nih.gov/29181666/

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A compliance-grade ledger of the GHK-Cu copper-tripeptide literature — every collagen study, skin trial and regulatory status posted as a line item and reconciled to its source, with no clinic behind the statement and nothing here for sale.