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the volumes used here are well within this limit [19]
Liang, Y., Duan, L., Lu, J
Triple-receptor binding profile distinguishes it from single-agonist and dual-agonist peptides
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
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