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Fortune

Beth Greenfield

How to know if you need to take vitamin B12

Vitamin Fortune NIH

Asian man in shirt and tie taking a pill and holding a glass of water (Credit: Getty Images)

Feeling low-energy? You could be among the estimated 3.6% of Americans who are deficient and 12.5% who get insufficient amounts of vitamin B12.

The first step to finding out is seeing your doctor, as Dr. Elizabeth Sharp, internist and medical director at Health Meets Wellness in New York City, previously told Fortune.

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