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Since it bypasses the digestive system, it can work faster and more effectively than oral supplements
doi: 10.1016/j.mehy.2013.11.013 307 BarzegariAKheyrolahzadehKHosseiniyan KhatibiSMSharifiSMemarMYZununi VahedS
Topical GHK-Cu serums contain the peptide at concentrations that vary widely by brand
GHK-Cu and Cellular Senescence: Downstream Oxidative Mechanism In aged fibroblasts identified by high SA--gal activity, GHK-Cu reduces SA--gal+ cells from 48% to 28% (41%), p16INK4a mRNA 2832%, and p21WAF1 2226% with 7-day treatment indicating partial reversal of the senescent phenotype
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