About this GHK-Cu research review

What This Project Is

Reviews GHK-Cu is a sourced readout of the peer-reviewed research on GHK-Cu, the copper tripeptide also labeled Copper Tripeptide-1. It runs no clinic and employs no clinicians. It offers no medical advice. It makes, sells, and ships nothing. The writing is commentary on published science, and every quantitative claim is cited.

The format is deliberate. GHK-Cu's research record is unusually numeric for a research peptide — collagen onset at picomolar concentrations ^[1], a 25.4-fold collagen-IV rise with hyaluronic acid ^[7], procollagen up in 70% of subjects against 40% for retinoic acid ^[3], a gene-modulation signature touching roughly a third of human genes ^[2] — so it is presented the way a product readout presents a feature set: the established findings forward, each tied to a study, and the gaps marked as gaps rather than smoothed over.

On the Word 'Reviews'

The 'reviews' in the name means a literature review, not a star-rated buying guide. What gets reviewed is the published research on GHK-Cu — the studies, their methods, and their limits. Products are not ranked, brands not recommended, vendors not linked. Where the evidence is strong, such as the in-vitro collagen dose-response ^[1] or the human penetration depot ^[5], the readout says so plainly. Where it stops, such as the absence of validated human pharmacokinetics for systemic GHK-Cu ^[11] or the single-investigator concentration of much of the foundational review literature, it says that just as plainly.

Two distinctions the wider conversation often blurs are kept visible: the difference between the free peptide GHK and the copper complex GHK-Cu ^[6], and the difference between in-vitro or rodent findings and controlled human evidence. A confident readout is only useful if its confidence is calibrated.

How We Source

Every quantitative claim maps to a numbered citation on the references page, drawn from PubMed, PMC, and peer-reviewed journals. The primary study is cited wherever possible, and it is noted when a figure comes from a review or a database analysis rather than a direct measurement ^[2]. Doses are not published as recommendations; where research administered a compound, the readout describes what was given, to which species or model, by which route, and at what concentration — as study context, never as guidance for use. The compound is a research peptide, and topical Copper Tripeptide-1 is a cosmetic ingredient; this site documents the research record and nothing more.