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2013, 11, e1001678 10.1371/journal.pbio.1001678

Fatigue, memory problems, weakness, numbness or tingling in extremities, balance issues, mood changes, and pale skin are common B12 deficiency symptoms in seniors

You must get it from food or supplements

B12 is essential for the health of your skin, hair, and nails as it plays a role in cell reproduction and therefore the renewal of your skin