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I havent seen this before, and its genuinely smart
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
What the evidence does support is this: B12 deficiency causes fatigue and neurological symptoms, and correcting deficiency in people who are deficient improves those symptoms
Glutathione brightens and detoxifies, while Collagen restores firmness and youthfulness
