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For research focused specifically on copper peptide mechanisms, yes GHK-Cu alone has decades of research behind it and is the gold standard for single-compound skin biology studies

While niacinamide inhibits the transfer of melanosomes from melanocytes to keratinocytes, alpha-arbutin acts upstream in the process by inhibiting the activity of tyrosinase, the key enzyme in melanogenesis

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But they came from a single research group, conducted in a single country, with limited independent replication a well-documented limitation in this literature