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For example, a 90-day study using a cysteine-rich whey protein (a glutathione precursor) improved adaptive behavior scores in preschoolers with ASD
108 LimC
Biomed Res Int 2014;2014:570647
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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