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This suggests that excessive GHK-Cu (or other copper peptides) might theoretically push skin MMP-1 concentrations beyond levels supporting healthy collagen production into ranges associated with collagen fragmentation and breakdown seen in older skin with naturally elevated MMP-1

N Engl J Med 365:21102121

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Known as the "master antioxidant," glutathione is essential for protecting cells from oxidative stress and damage caused by free radicals