A member asked:
i've recently had 1000mg of b12 (apparently correct dose for my weight). could this have an effect on my menstrual cycle? my last period was june 3. i have taken a pregnancy test that has come back negative.
3 doctor answers • 5 doctors weighed in
Dr. Howard Cohenanswered
Cardiac Electrophysiology 61 years experience
Probably not: Several of the B vitamins including B12 are necessary for a normal menstrual cycle, but taking B12 is unlikely to be the cause of missing a menstrual cycle completely. I assume there is a specific reason for taking the B12, because a normal diet would supply enough unless you have a condition in which your body cannot absorb the B12 or your body is unable to effectively use the B12 it gets.
607 viewsReviewed >2 years ago
A Verified Doctoranswered
A US doctor answeredLearn more
No : B 12 injections do not affect the menstrual cycle . Please repeat the pregnancy test and see your GP .
505 viewsReviewed >2 years ago
Dr. Jovita Anyanwuanswered
Internal Medicine 30 years experience
Vitamin B12: injection will not affect your periods. However if you are exercising and losing weight the the weight loss and intense exercise can cause you not to have periods
504 viewsReviewed >2 years ago
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Last updated Nov 27, 2017
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