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Each has its own detailed guide start here for the overview, then follow the links for the deeper science on any single one
Cardoso AP, Goncalves RM, Antunes JC, Pinto ML, Pinto AT, Castro F
Published work exists on both forms independently, including studies on copper-free GHK, so a protocol should state which species is intended and control the copper content of the medium accordingly
While more human research is needed, early results are very promising
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