It included a sample of 47 different prenatal vitamin, including 32 non-prescription and 15 prescription products that the researchers checked for arsenic, lead and cadmium – toxic chemicals.

Pregnant women with low vitamin D levels during the first trimester were four times more likely to give birth prematurely ...

Vitamins taken by pregnant women contain ... to measure the actual amounts of choline and iodine in a large sample of prenatal supplements. When checking for iodine - which can cause thyroid ...