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Summary of AC use daily vs. use every 48 hours. For comparative purposes, data for collagen density and fragmentation, the elasticity R2 index, profilometry Rz index (wrinkles), and expert visual grading of skin even tone (pigmentation distribution) are expressed as percent change from baseline. Each parameter was expressed as daily use of the supplement or use every 48 hours (∗p < 0.05; ∗∗p < 0.01).
