Vitamin B<sub>12</sub> deficiency can be sneaky and harmful

Like most vitamins, B12 can't be made by the body and must be gotten from food or supplements. A B12 deficiency &ndash;&ndash; which might stem from a vegan or vegetarian diet, or problems with absorption due to weight loss surgery or aging &ndash;&ndash; can seriously harm nerves, mood, thinking, energy, and more.

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