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Many vitamins, like Vitamin C, have an absorption ceiling, meaning excess amounts are simply flushed away

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

doi:10.1016/S0306-3623(96)00474-0

(1997) Vitamin B12 treatment for delayed sleep phase syndrome: a multi-center double-blind study

How exactly do I know if I need a cognitive peptide

Su L, Zhang J, Gomez H, Kellum JA, Peng Z (2023) Mitochondria ROS and mitophagy in acute kidney injury