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PubMed: (peer-reviewed) Li X, et al

This targeted under-eye treatment addresses dark circles, crepey texture, fine lines, hollowing, and tired appearance while improving brightness, skin thickness, firmness, and collagen density

doi: 10.1016/s0092-8674(00)81402-6

This is also why GHK-Cu appears frequently in longevity-adjacent research alongside other compounds studied for age-related cellular changes, since a quantifiable, age-correlated decline gives researchers a concrete variable to test against rather than a purely theoretical one

Add an appropriate volume of BAC water directly to the vial, then gently swirl do not shake until the powder is fully dissolved