In reference to: ...Iron (found in prenatal vitamins in very high doses)...I was prescribed prenatal vitamins (with Iron) with my first child (a daughter born in 1979). I took one exactly once. I had the most god awful pains (constipation) and could barely turn at the waist. I told the Nurse Practitioner that I wasn't going to take the vitamins anymore and she said that was OK. She said that my Iron level had dropped (which was why she gave me Iron supplementation) but that it was still above the norm. She told me to keep eating what I was already eating and not to worry about the vitamins anymore.