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.
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.
