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The difference does not change dramatically overnight if you compare your own vitamin C serum before and after
3 The results: + GHK-Cu increased collagen in 70% of women treated + Vitamin C cream increased collagen in 50% of women + Retinoic acid increased collagen in 40% of women This is one of the few studies that put three gold-standard anti-aging ingredients side by side and GHK-Cu outperformed both
Well, for one, I do
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