GHK-Cu stands out in the research-peptide catalog for two reasons: it occurs naturally in human plasma, and its copper complex gives the lyophilized powder a distinctive pale blue color. Here is what the literature actually documents.
What GHK-Cu is
GHK-Cu is the tripeptide glycyl-L-histidyl-L-lysine complexed with a copper(II) ion (CAS 89030-95-5, C14H24N6O4·Cu, ~402.9 g/mol). The free peptide GHK was first isolated from human plasma in the 1970s; its plasma concentration is documented to decline substantially with age, an observation that has driven much of the subsequent research interest.
What the literature documents
The GHK-Cu literature spans decades and is concentrated in in-vitro and preclinical work: studies in cell culture and animal models describing activity related to copper transport, extracellular-matrix remodeling enzymes, and gene-expression modulation. A separate, substantial body of cosmetic-science literature studies topical formulations containing the peptide, and it is an established ingredient in the cosmetics industry. As a systemic therapeutic, GHK-Cu is not an approved drug, and rigorous human clinical evidence outside the cosmetic-formulation context is limited.
Regulatory status, stated plainly
GHK-Cu is not an FDA-approved drug for any indication. Its presence as an ingredient in cosmetic products does not change the status of bulk peptide sold for research: material in this market is not a drug, a cosmetic, or a supplement, and is intended solely for laboratory use.
Why it appears in research settings
- Copper biology. As a well-characterized copper-binding peptide, it is a standard tool for studying copper transport and copper-dependent enzyme systems in vitro.
- Matrix and gene-expression studies. The documented literature on ECM-related enzymes and expression profiling makes it of interest to cellular-research groups.
- Formulation science. Cosmetic-science teams study its stability and delivery in topical systems.
A note on the blue color
The pale blue of GHK-Cu powder comes from the copper complex itself. Color is not a purity test, but a vial of GHK-Cu that is not blue is a reason to check the documentation. Our product page lists specifications and the current lot, with certificates published in the COA ledger as testing completes.
Related reading: why copper binding matters in GHK-Cu research.
All products sold by Revoryn Labs are intended for laboratory and in-vitro research use only. Nothing here is a claim of safety or efficacy for any use.
For laboratory and in-vitro research use only. Not for human or veterinary use. See our research-use disclaimer.
