Overview
GHK-Cu — the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine — is one of the most extensively studied naturally occurring peptides in the field of skin biology and regenerative research. First isolated from human plasma in 1973 by Loren Pickart, GHK was initially identified as a factor that promoted liver cell survival in culture. The peptide occurs naturally in human plasma, saliva, and urine, with plasma concentrations declining significantly with age — from approximately 200 ng/mL in young adults to roughly 80 ng/mL by age 60. This age-related decline has generated considerable scientific interest in GHK-Cu as a research model for studying the molecular mechanisms of skin aging and tissue maintenance.
Mechanism of Action
GHK-Cu exerts its effects through multiple, partially overlapping mechanisms that collectively promote extracellular matrix synthesis, remodeling, and cytoprotection. The primary mechanism involves stimulation of collagen and elastin synthesis in dermal fibroblasts. In vitro studies have demonstrated that GHK-Cu increases the production of collagen types I, III, and IV, as well as elastin and glycosaminoglycans. A second major mechanism involves the regulation of matrix metalloproteinases (MMPs) and their inhibitors (TIMPs). GHK-Cu upregulates MMP-2 (gelatinase A) while simultaneously increasing TIMP-1 expression, suggesting a role in balanced matrix remodeling rather than simple matrix dep
Research Evidence
- Stimulates collagen types I, III, and IV synthesis in dermal fibroblasts (Pickart et al., 2018)
- Regulates MMP-2 and TIMP-1 for balanced extracellular matrix remodeling (Siméon et al., 2000)
- Modulates expression of >4,000 human genes via epigenetic mechanisms (Pickart et al., 2017)
- Increases antioxidant enzyme activity including superoxide dismutase (SOD)
- Promotes nerve outgrowth and blood vessel formation in preclinical models
Bottom line: GHK-Cu has one of the most robust research foundations of any anti-aging peptide, including published human skin studies. It
Research Protocols & Dosage
Evidence-based research protocols, administration routes, and dosage considerations for GHK-Cu are detailed in the full compound profile. See also: Dosage guide for GHK-Cu.
Sourcing & Quality
GHK-Cu is available from Purgo Labs with third-party COA verification and research-grade purity standards. View GHK-Cu at Purgo Labs.