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HYDROQUINONE works by inhibiting the synthesis of melanin, which is the pigment that gives your skin its color
What is clearer is that stacking multiple strong actives at once increases the overall irritation burden on the skin barrier, which is a general skincare principle rather than a GHK-Cu-specific danger
Appenzeller-Herzog C (2011)
Morning routine: Glutaday Face Wash Moisturiser SPF 50 Sunscreen
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