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L-ascorbic acid requires a low pH (typically below 3.5) to remain stable, and that acidic environment can disrupt the copper complex in GHK-Cu, potentially degrading both ingredients

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doi: 10.1080/1028415X.2020.1764292 [DOI] [PubMed] [Google Scholar] 215.Merenstein D, Pot B, Leyer G, Ouwehand AC, Preidis GA, Elkins CA, et al

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Mass spectrometry (MS) confirmation is a secondary but important quality indicator