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If youre curious about trying a GHK-Cu serum or other copper peptide skin care products: Look for formulations containing copper peptides (around 0.11% is typical in cosmetic products as higher percentages are less commonly standardised)
It's interesting to note that average levels often creep up as we age, but if longevity is your goal, you really want to be aiming for the lower end of that "normal" range
Please click through to the referenced study for more details
Karanicolas for comments on the manuscript
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