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Vitamin B12 is a water-soluble vitamin that maintains nerve and brain health, while also aiding in red blood cell production (via Healthline)

These reactions are central to ATP generation, DNA repair, and cell signaling, so adequate B supports energy levels and normal cell function

B12 from food and supplements has to pass through a fairly involved process in the stomach and gut before your body can use it, and that process becomes less efficient with age, with certain medications, and with diets that include little or no animal protein