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One study found that a single night of sleep deprivation was associated with a significant reduction in glutathione and other antioxidant levels
A 2021 systematic review of 16 randomized controlled trials and 6,276 participants (Markun and colleagues, Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue, Nutrients, 2021) found that B12 supplementation does not reliably reduce fatigue in people who are not deficient
And a longer period of Sam Rhee: time
It also supports mood stability and mental clarity, making it a powerful tool for optimizing long-term brain health and performance
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