Animals
Review of copper peptide GHK-Cu studies finds many lab results but few human trials
Researchers read 64 studies on GHK-Cu, a copper-linked peptide, and found much lab and animal work. They say well-designed human trials using microneedles are still needed.
Animals
Review of a copper peptide used in skin treatments
Researchers reviewed 20 studies on GHK-Cu, a copper peptide, for skin and beauty uses. Most were lab or animal studies, and only two were human trials, so more strong testing is still needed.