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7,9,10 Limitation: most of that literature uses clinic-depth needling for scars and photoaging

The 500 Dalton rule suggests small peptides can cross the stratum corneum, but intact copper coordination and hydrophilicity reduce net penetration

Although this study found changes in the expression level of GST in the MCI group, it did not make a clear distinction between patients who progressed to AD and those who did not

Understanding GHK-Cu's limited shelf life prevents applying ineffective degraded peptide while optimizing storage conditions preserves the proven anti-aging benefits you paid for

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