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Biologically active vitamin B12 compounds in foods for preventing deficiency among vegetarians and elderly subjects
B12 is found in animal products and some fortified foods so if you're vegan or vegetarian, talk to your doctor about supplements
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
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