total glutathione low - an overview Glutathione-mediated plant response to high-temperature

However, it is not recommended to combine it directly with high concentrations of vitamin C (L-ascorbic acid) or AHAs, as the acidic pH of these actives can destabilize the copper complex and reduce GHK-Cu efficacy

Cells 12 , 500 (2023)

It is a 15-amino-acid peptide associated with a protective protein found in human gastric juice

Some experts advocate for higher levels in specific populations, but evidence for additional benefits above 50 ng/mL is limited

Skin often breaks out from copper peptides because GHK-Cu actively signals skin regeneration, which can surface underlying clogged pores, low-grade inflammation, or trapped sebum during the first few weeks of use

The Cosmetic Ingredient Review panel has assessed copper peptides as safe for cosmetic use