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A 2017 RCT confirmed that even a double-conjugated retinoid formulation caused significantly more erythema than vehicle, though it was more tolerable than standard tretinoin

Research suggests GHK-CU has a relatively short half-life, making twice-daily administration theoretically superior for sustained gene expression effects

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Research comparing these approaches head-to-head remains limited, leaving the choice to researcher preference and practical considerations

10.1111/bph.14487 19 AnH.-J.LeeW.-R.KimK.-H.KimJ.-Y.LeeS.-J.HanS.-M.et al (2014)