The copper peptide GHK-Cu stimulated collagen synthesis in fibroblasts starting at just 10 picomolar — with peak effect at 1 nanomolar — independent of cell growth.
Active at 10 picomolarExtraordinarily low concentration — suggesting high-affinity receptor-mediated signaling
What the researchers found
GHK-Cu stimulated collagen synthesis in fibroblast cell cultures. The effect began at concentrations between 10 picomolar (10^-12 M) and 100 picomolar (10^-11 M), an extraordinarily low threshold.
The stimulation maximized at 1 nanomolar (10^-9 M). Above this concentration, the effect plateaued.
The collagen increase was independent of cell number changes. GHK-Cu was not simply making more cells; it was making existing cells produce more collagen.
A GHK tripeptide sequence (glycine-histidine-lysine) exists naturally within the alpha 2(I) chain of type I collagen. The authors proposed that when wounds break down collagen, proteases could release GHK fragments. These fragments would then bind copper and stimulate new collagen production at the wound site, creating a self-healing feedback loop.
Why it matters
This study provided the biochemical basis for GHK-Cu's wound healing effects. The picomolar activity is remarkable because most peptides need much higher concentrations to work. The collagen feedback theory (wounds release GHK, which stimulates repair) is elegant and explains why this peptide is found in blood plasma.
How the study worked
Fibroblast cell cultures were treated with GHK-Cu at various concentrations. Collagen synthesis was measured biochemically. Cell counting confirmed the effect was not due to increased cell proliferation. Structural analysis identified the GHK motif within type I collagen.
What this study cannot tell us
In vitro cell culture study. The picomolar activity is impressive but needs confirmation in living tissue and whole organisms. The collagen feedback theory from wound sites, while logical, was not directly demonstrated. Only fibroblasts were tested; effects on other cell types were not examined.
How to read the evidence
Preliminary in-vitro study in fibroblast cultures — strong dose-response but limited to cell culture.
When this study was published
Published in 1988 — one of the earliest demonstrations of GHK-Cu collagen-stimulating activity.
The bigger picture
GHK-Cu is one of the most potent known stimulators of collagen synthesis. Its effectiveness at picomolar concentrations and presence in human blood makes it a natural wound healing signal with significant therapeutic potential.
Questions still open
- Is collagen-derived GHK a natural wound healing feedback signal?
- Can topical GHK-Cu treat chronic wounds and skin aging?
- What is the mechanism at such low concentrations?
Common questions
What is GHK-Cu?
Why does it work at such tiny amounts?
Read the original research
Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+.
FEBS letters, 238(2), 343-6
Citation
Maquart, F X; Pickart, L; Laurent, M; Gillery, P; Monboisse, J C; Borel, J P. (1988). Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+.. FEBS letters, 238(2), 343-6.