GHK-Cu: the copper peptide behind the GLOW stack

GHK-Cu is a copper complex of glycyl-L-histidyl-L-lysine, a tripeptide first isolated from human plasma in the 1970s. Its small size and well-characterized chemistry have made it a fixture of cosmetic-science and extracellular-matrix research for decades.

What the literature examines

Published studies investigate GHK-Cu in laboratory models of skin biology, collagen and matrix synthesis, and wound-repair signaling. This is preclinical and cosmetic-science research: the compound is supplied for laboratory research use only, and nothing in the literature constitutes a medical claim about any finished product.

In the GLOW stack

GHK-Cu is the named component of the Opa Peptides GLOW research stack, where it is supplied alongside complementary catalog compounds as a convenience set for protocols that use them together. Each vial in the stack carries its own lot reference and independent identity and purity testing.

Quality checks before you work with it

• Identity by mass spectrometry, matched to the theoretical mass of the copper-peptide complex.
• Purity by HPLC with the chromatogram attached, not just a headline percentage.
• A certificate of analysis whose lot number matches the vial label.
• Cold, dark storage — the peptide-copper complex tolerates transit well lyophilized but should be refrigerated in solution.

Research use only. This overview summarizes published research for context and is not medical, therapeutic, or cosmetic guidance.