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The transcriptomic literature has been a substantial portion of the GHK-Cu research expansion in the 2000s and 2010s

Folia Horticulturae

Recently, GPx4 was predicted to be a specific target for new pharmacological therapies aimed at activating or inhibiting cell death in cancer or degenerative diseases [110]

So, when you ask collagen and glutathione which is better, the honest answer is both, depending on your skincare goal

GHK-Cu can hardly be called a miracle molecule, but the scientific evidence that already exists seems to indicate that this substance could have significant medical applications in the future

Ye et al., 2016)