ghk cu peptide adverse effects A Dermatologist's Take on the Copper (GHK-Cu) Trend Selected Biomarkers Revealed Potential Skin
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J Biol Chem 2002;277:252038

And this is not confined to real-world users but is also being discussed in research papers

The following adverse reactions have been reported in male and female adolescents: premature closure of bony epiphyses with termination of growth, and precocious puberty
