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The clinical trial most often cited is Leyden and colleagues' 2002 randomized 12-week trial of a GHK-Cu facial and eye cream in 71 women with photoaged skin [4]
It is used in skincare because it tends to be more formulation friendly than pure vitamin C (ascorbic acid)
While the FDA doesn't approve cosmetic ingredients, topical GHK-Cu peptide is generally considered safe and is available in over-the-counter products
US, ultrasound
10.1161/01.cir.97.19.1930 Circulation
Less than two servings in 24 hours didnt show any results
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