GHK-Cu is a copper-binding tripeptide — glycyl-L-histidyl-L-lysine complexed with copper(II). Unlike most research peptides, it occurs naturally in human plasma, where its concentration declines substantially with age. That decline is what first drew research interest.
Structure and mechanism
The peptide is three amino acids long and its activity is inseparable from the copper ion it carries. GHK has high affinity for copper(II), and the complex — not the bare peptide — is what shows biological activity in most assays.
Its best-documented action is on dermal fibroblasts. In fibroblast culture, GHK-Cu stimulates collagen synthesis at concentrations as low as 10−12 M, reaching maximum effect around 10−9 M where collagen synthesis increases by roughly 80%. That is an unusually low effective concentration and is one reason the peptide is well studied.
It also increases synthesis of elastin and glycosaminoglycans, and raises expression of basic fibroblast growth factor and VEGF, both associated with vessel formation.
Matrix remodelling, not just synthesis
A detail often lost in summaries: GHK-Cu appears to modulate matrix turnover in both directions. In human adult dermal fibroblasts it has been reported to increase gene expression of MMP1 and MMP2 — enzymes that break matrix down — while also increasing TIMP1, their inhibitor.
The interpretation in the literature is that this reflects balanced remodelling rather than bulk deposition, which is also why preclinical wound models describe reduced fibrosis alongside faster epithelialisation. Piling on collagen and remodelling tissue properly are different things.
The broad gene-expression claim
GHK-Cu is frequently described as modulating “over 4,000 human genes,” a figure originating from Broad Institute Connectivity Map analyses. That number is real but routinely over-interpreted. Connectivity Map data show transcriptional signatures in cell lines at particular concentrations — it is a hypothesis-generating screen, not a demonstration that a compound reverses ageing in a person.
Research status
The evidence base is heavily in vitro and topical. Fibroblast culture work is extensive and reproducible; preclinical wound-healing models are reasonably consistent. Human data outside topical dermatological use is thin, and systemic research use should be understood in that light.
Handling
Supplied lyophilised. Copper complexes are light-sensitive — keep the vial protected from light and cold. See our reconstitution protocol for reconstitution technique.
View GHK-Cu 100mg and its third-party COA.
Research use only
Isla Longevity supplies this compound for laboratory research use only. It is not approved by the FDA for human or veterinary use and is not for human consumption. This article summarises published research and is not medical guidance.
