Peptides like GHK-Cu are frequently explored in experimental models focused on peptide signaling and biological peptide interactions
Am J Respir Crit Care Med 171 : 431439 Fitzpatrick AM, Brown LA, Holguin F, Teague WG, National Institutes of Health/National Heart, Lung, and Blood Institute Severe Asthma Research Program 2009 Levels of nitric oxide oxidation products are increased in the epithelial lining fluid of children with persistent asthma
For someone mainly interested in skin tightening, tissue repair, or age-related skin changes, GHK-Cu is generally the more extensively researched of the two
This depends on why you started supplementation
Can I take glutathione for skin lightening while pregnant
Sutovska H, Babarikova K, Zeman M, Molcan L