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GHK-Cu, in contrast, delivers copper(II) ions to metalloenzymes such as lysyl oxidase (critical for collagen and elastin cross-linking), superoxide dismutase (antioxidant defense), and cytochrome c oxidase (mitochondrial respiration)

Figure 3E] was statistically significant

Without proper delivery, even the best ingredients won't reach your cells

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Vitamin shots in Chicago containing antioxidants like glutathione and vitamin C can improve skin clarity, reduce signs of aging, support collagen production, and brighten the complexion

L-ascorbic acid might be the most researched, but I never got to see any results from it because it was so irritating