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The Bottom Line GHK-Cu sits in a strange spot in the peptide research world genuinely old research (Pickart's earliest work goes back to the 1970s), genuinely broad mechanistic reach (thousands of modulated genes), but still a compound where the human clinical trial base lags behind the mechanistic and cell-culture data

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This approach enables incorporation of modified amino acids and other chemical modifications that may improve therapeutic properties

Unlike older peptides like GHRP-6 or GHRP-2, it does not cause a massive spike in ghrelin (the hunger hormone) that leads to overeating

Simple timing framework Baseline Discuss baseline labs before starting, especially if there is active injury, gut symptoms, infection concern, liver disease, kidney disease, or medication use

This flexibility is essential in research