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Dermstore A splurge-y serum from a popular Spanish brand "I often recommend Isdin's Melatonik serum, which includes melatonin, vitamin C and bakuchiol alongside copper peptides for nighttime repair," said Cheung

GHKCu helps reverse this by stimulating collagen and elastin at the cellular level

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A mislabeled or substandard formulation can introduce variables that are nearly impossible to identify after the fact

The copper delivery hypothesis proposes that GHK-Cu regulates intracellular copper levels, which in turn affect copper-dependent transcription factors and enzymes

Heres our take: Theyre both winners, but they shine in different situations