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A member asked:
Can b12 injections cause irregular heavy menstrual bleeding?
A doctor has provided 1 answer
NO: Vitamin B12 is extremely safe and has no known toxicity. There is no known association with menstruation. See http://www.Crnusa.Org/safetypdfs/013crnsafetyvitaminb12.Pdf if you have heavy bleeding B12 (along with iron & folic acid) will help you make new blood cells. Irregular heavy bleeding may be caused by fibroid tumors or other imbalances and should be evaluated by a gynecologist.
Answered 6/24/2014
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