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Clinical and lab studies show topical GHKCu can tighten lax skin, thicken thinned dermis, improve elasticity, smooth roughness, reduce wrinkle depth, and fade photodamage and mottled pigmentation

ClinicalTrials.gov lists 3 ongoing or completed trials (accessed February 12, 2026): NCT05239615 (topical for photoaging, Phase II, completed 2024, no results posted) [12]

Testing on real hair follicles (ex vivo organ culture) They collected hair follicles from the occipital (back) scalp region of 10 healthy volunteers aged 2035
