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Vitamin B12 deficiency is dangerous because your body needs B12 to make red blood cells. These cells bring oxygen to organs throughout the body. If there are not enough red blood cells, you may become anemic. Symptoms include fatigue, weakness, depression, dementia, numbness, paleness, and more. Those on a vegan diet may need to take a B12 supplement to prevent anemia. Treatments for a vitamin B12 deficiency include vitamin B12 shots and supplements. Follow the links below to find WebMD's comprehensive coverage about how vitamin B12 deficiency is caused as well as symptoms, treatments, and much more.

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Thumbnail: Vitamins and Supplements: Test Your Knowledge

How many people use vitamins and supplements? Which ones are most popular? Do our doctors use them? Here’s a rundown of some important supplement statistics, based on the best available data.

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