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There are several causes of vitamin B12 deficiency, including poor dietary intake, malabsorption, and pernicious anemia

Vitamin B12 is water-soluble, meaning your body eliminates excess through urine rather than storing it to potentially toxic levels

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What Is Vitamin B12 and Why Does the Body Need It

A lack of vitamin B12 can often lead to fatigue and weakness due to megaloblastic anemia a blood disorder that causes unusually large red blood cells (megaloblasts) and a lower red blood cell count, which results in a lower supply of oxygen to the body