Dot it evenly across your face and gently smooth it in with your fingertips
Because studies have evaluated GHK-Cu across multiple cell types (including fibroblasts and keratinocytes) and in preclinical models, it is commonly used to support mechanistic work on aging-related tissue changes, repair biology, and copper homeostasisstrictly within controlled research designs
It is also investigated in oxidative stress and cellular defense pathways, where it helps model how peptide signaling interacts with antioxidant systems and metabolic regulation
71 Injections may sometimes cause minor irritation, redness, or itching at the injection site
Glucose 6-phosphate dehydrogenase deficiency increases redox stress and moderately accelerates the development of heart failure
Some users may experience mild nasal irritation or dryness during initial use