finkey et al ghk cu study GHK-Cu may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes Topically applied GHK as an

While H3K27me3-enriched Foxa1 gene was in greater amounts in sperm from subfertility bulls, the others were enriched in sperm from high-fertility bulls (168)

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[DOI] [PMC free article] [PubMed] [Google Scholar] 58.Balenovic D., Bencic M.L., Udovicic M., Simonji K., Hanzevacki J.S., Barisic I., Kranjcevic S., Prkacin I., Coric V., Brcic L., et al

Since copper is essential for the activity of GHK, GHK-Cu is more bioactive than Pal-GHK [9]

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Even then, not all experienced obvious improvements some reported the subtle changes made them uncertain whether peptides or other modifications were the cause