Iron increases a woman's chance of becoming pregnant.

Recent Finding: Women who take daily iron supplements have, on average, 40% lower risk for infertility caused by ovulation problems than those who don't take iron supplements. The higher the iron dosage, the lower the risk for infertility. Women who take the highest doses-41 mg a day-reduced their risk for infertility by 62%. Caution: Take iron supplements only under a doctor's supervision. Iron overload can cause damage to internal organs.
Jorge E. Chavarro, MD, research fellow, department of nutrition, Harvard School of Public Health, Boston, and lead author of an eight-year study of women ages 24-42, published in Obstetrics & Gynecology. (Quoted from Bottom Line Personal Volume 29 Number 8)