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20 Important Facts About Vitamin B12 Deficiency Logo By Esther Crain of | Slide 1 of 20: Ingredients for protein diet

The energy vitamin

Vitamin B12 is a powerhouse. It helps make DNA, nerve and blood cells, and is crucial for a healthy brain and immune system. Your metabolism wouldn't run smoothly without it.

But B12 isn't like other vitamins. It's only found in animal products like eggs, meat, shellfish, and dairy. Up to 15% of people don't get enough B12, and they're more likely to be vegetarians, have celiac disease or other digestion problems, or be an adult over 50.

The signs of vitamin B12 deficiency include exhaustion, rapid heartbeat, brain fog, and other symptoms, says Maggie Moon, RD, a Los Angeles–based nutritionist and owner of Everyday Healthy Eating. Read on to find out more about the causes, symptoms, and cures for a vitamin B12 deficiency.

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