Does Vitamin B-12 Cause Bleeding?

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Alternative Names

Cobalamin; Cyanocobalamin


Side Effects

A lack of vitamin B12 (B12 deficiency) occurs when the body does not get or is unable to absorb the amount of vitamin that the body needs.

  • Many people over age 50 lose the ability to absorb vitamin B12 from foods.
  • People who follow a strict vegetarian or vegan diet and do not consume eggs or dairy products may need vitamin B12 supplements.
  • Those who have had gastrointestinal surgery, such as weight loss surgery,...
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