Skip to content

    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.

    Medical Reference

    Features

    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.

    Read Full Article

    Quizzes

    News Archive

    Healthy Recipe Finder

    Browse our collection of healthy, delicious recipes, from WebMD and Eating Well magazine.

    Top searches: Chicken, Chocolate, Salad, Desserts, Soup

    Heart Rate Calculator

    Ensure you're exercising hard enough to get a good workout, but not strain your heart.

    While you are exercising, you should count between...

    -
    Beats
    PER
    Seconds