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Pharmaceutical-grade GHK-Cu from reputable suppliers with verified Certificates of Analysis showing purity of 95% or higher, along with heavy metal and endotoxin testing, is non-negotiable
The GHK Tripeptide and Its Copper Complex The GHK sequence glycine, histidine, lysine is small enough to qualify as a "signal peptide," meaning it interacts with cell-surface and intracellular targets to alter transcriptional programs rather than acting as a structural building block
10.1016/j.amjmed.2012.05.029 44 Dominguez RiegJ
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