what are the most important ingredients in prenatal vitamins?
['400micrograms (mcg) of folic acid.', '400 IU of vitamin D.', '200 to 300 milligrams (mg) ofcalcium.', '70 mg of vitamin C.', '3 mg of thiamine.', '2 mg of riboflavin.', '20 mg of niacin.', '6 mcg of vitamin B12.']