Yes, GHK-Cu can be used with many other active ingredients, but some combinations should be approached with caution
Sustained dysregulation of iron and glutathione homeostasis induces chronoferroptosis, a persistent ferroptotic adaptation in neuronal cells
The N-terminal domain consisting of 80-odd residues adopts a thioredoxin-like fold and harbors the G-site, which binds glutathione with a number of highly conserved residues as well as with ionic bonds from Asp101 and Glu 131 in the adjacent subunit (Sinning et al., 1993)
Consider also the issue of informed consent
Integrative Medicine: A Clinician's Journal, 14 (4), 35-48
while normal dietary intake is considered safe, the effects of high-dose parenteral administration are less well studied