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Every efficacy claim is extrapolated from single-ingredient data, most of which is preclinical (animal or cell-culture)
In the Lancet 2021 Phase 2 trial at 4.5 mg/week, nausea occurred in 47% of participants, injection-site reactions in 43%, constipation in 21%, and vomiting in 8%
This is the exploratory phase
Emerging research suggests that GHK-Cu may delay premature greying by reducing oxidative stress in follicular cells, though more evidence is needed
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