7 Signs of Vitamin B12 Deficiency Every Runner Should Know

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7 Signs of Vitamin B12 Deficiency Every Runner Should Know
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Experts explain what signs to look for when it comes to vitamin B12 deficiency, plus how to replenish your stores.

Feeling extra fatigued lately? There are lots of reasons why you may not have the usual pep in your step—from overtraining to underfueling to poor sleep habits that are hampering your recovery. But one less obvious factor worth considering: vitamin B12 deficiency.Most people are not at risk for B12 deficiency, Selvi Rajagopal, M.D., M.P.H., assistant professor of medicine at The Johns Hopkins University School of Medicine, tells Runner’s World.

In addition to oral irritation and frequent ulcers, you may also notice changes to your tongue, including pain, swelling, tenderness, or pigmentation changes, Rajagopal explains. Skin changes, like rashes and changes in pigmentation. Again, this is because B12 plays a vital role in cell production, Loafman explains, so when your levels are subpar, you may notice it influences your skin health. GI symptoms, including nausea and diarrhea.

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