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What is GHK-Cu and Why It Matters for Skin GHK-Cu, also known as copper peptide or the copper complex of glycine-histidine-lysine, is a naturally occurring tripeptide that has gained significant attention in skincare science

Its use depends on clinical indication, medical history, lab markers, and regulatory appropriateness

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In addition to a local effect, dietary Gln supplementation has been described to cause an increase of the systemic Gln concentration, which may also sustain the health and function of immune and epithelial cells 39