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Common impurities to check include truncated peptide sequences (Gly-His or His-Lys fragments), residual coupling reagents and protecting groups, counterion residues, free (uncomplexed) GHK, and excess copper salts
Internally, fibroblast activity, collagen synthesis signaling, and anti-inflammatory gene modulation are underway
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But "generally safe" doesn't mean "risk-free." Understanding potential issues helps you use copper peptides responsibly
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