Reality check GHK Cu shows interesting and coherent biology on paper
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The 2025 IV pilot measured cardiac, hepatic, renal, thyroid, and glucose biomarkers and reported no abnormalities (Lee et al., 2025), which gives a sense of what those investigators considered worth checking
[4] Richie JP Jr, Nichenametla S, Neidig W, Calcagnotto A, Haley JS, Schell TD, Muscat JE
They are better absorbed into the skin and target specific skin concerns more effectively
