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Vitamin B12 is necessary for ensuring that red blood cells, brain function, and nerve tissue remain healthy and productive. The human body can store several-years-worth of B12, although people following a vegetarian or vegan diet or those with absorption issues are at risk of deficiency. A vitamin B12 deficiency or cobalamin deficiency is relatively common -- there are more than 3 million cases of vitamin B12 deficiency in the United States alone.

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1. Loss of Muscle Strength

When doctors cannot trace muscle fatigue to a specific issue such as an over-the-top workout or a recent illness, they may look into a vitamin B12 deficiency. Too little of this vital nutrient can restrict the amount of oxygen reaching the red blood cells, which affects muscle strength to varying degrees.

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