GHK Cu is one of the few peptides in this space with genuine randomized controlled trial data. A 2023 split face RCT in 60 participants showed a 22% improvement in skin firmness and 16% GHK Cu GenScript GHK Cu Peptide: Turn Back the Clock Naturally Calibrate Hydration Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms
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ghk cu human trials Synergy of GHK‐Cu and hyaluronic acid on collagen IV upregulation via fibroblast and ex‐vivo skin tests - Jiang - 2023 - Journal of Cosmetic Dermatology