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In vitro models show it enhances superoxide dismutase activity for antioxidant effects and stimulates metalloproteinases for matrix turnover

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The ratio GSH/GSSG which works as a cellular redox switch determines the oxidative status of the cells and is delicately maintained by the activity of these two enzymes [11]

the best-evidenced caffeine + L-theanine 2:1 calm focus stack, backed by a 2026 Molecular Psychiatry meta-analysis of 31 randomised trials and a 2025 British Journal of Nutrition sleep-deprivation study

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Surprisingly, nothing felt too intense for my skin which is something that's happened before with powdered vitamin C boosters