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All stability samples were qualified by the result that there were no significant difference compared to the result in precision (Table 1)

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

Social Disparities in Thoracic Surgery Database Research: Implications and Impact

doi: 10.1055/s-2007-1024611

Its job is fundamentally metabolic and hormonal

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