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Even a recent 2026 review concludes the same thing that GHK-Cu appears safe but the evidence is largely preclinical and comprehensive human RCTs are lacking (Wojcieszuk et al., 2026)

Preclinical research summary Preclinical investigations include studies in fibroblasts and skin-relevant cellular systems, focusing on ECM biosynthesis and remodeling markers

But its essential to talk with our dermatologist before starting any skin-whitening treatment to make sure it is secure and suitable for your pores and skin type and common health

Furthermore, meiotic disorders and changes in gene expression have been reported in numerous studies [29,30,31,32,33]