Can prenatal vitamins cause diarrhea?

It's possible. For some women, prenatal vitamins can cause unwanted symptoms. Nausea is common, but diarrhea is also possible. If you are having this problem, you may want to switch to a different type of vitamin - I find that chewable or gummy vitamins are usually better tolerated.
Yes. It is possible that it might be the cause if you've started taking it and nothing else has changed in your diet.

Related Questions

Can 50 mg of mag oxide in prenatal vitamins cause watery watery stools? Just found out I'm pregnant, just started these today, 1-2hrs later, diarrhea

Not likely. Although high doses of magnesium can cause diarrhea, 50 mg is not likely to be the cause. 500 mg might cause diarrhea in a few folks--but it usually takes in excess of 1,000-2,000 mg for diarrhea to result. Read more...