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Other copper-peptide complexes exist in research literature, but GHK-Cu is the one most closely associated with the term because it was the first to be isolated and remains the most widely referenced in copper-peptide research
Detection windows vary from a few hours to several weeks depending on the peptide
(PubMed) Xiang GD, Sun HL, Zhao LS, Hou J, Yue L, Xu L
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