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However, whether the addition of Zn 2+ would affect the angiogenic ability of Cu 2+ -Qu complex was a key issue to be clarified in this study, since the Zn 2+ alone is not considered as an activator of angiogenesis [80]

Mechanistically, GHK-Cu counteracts UV-induced damage through multiple pathways: suppression of UV-stimulated MMP-1 expression prevents ongoing collagen degradation, enhancement of collagen synthesis repairs existing deficits in dermal matrix density, and antioxidant properties reduce accumulation of oxidatively modified proteins and lipids

8 BaiF.GuoF.JiangT.WeiH.ZhouH.YinH.et al (2017)

Zinc - Zinc and copper compete for absorption