Final answer:
The recommended folic acid dosage for women who might become pregnant is 400 micrograms (µg) per day, which is equivalent to 0.4 milligrams (mg). This intake is essential for preventing neural tube defects in developing fetuses.
Step-by-step explanation:
The recommended dosage of folic acid for replacement therapy varies depending on individual needs, such as during pregnancy or in cases of deficiency. However, the Food and Nutrition Board of the Institute of Medicine recommends that all women who might become pregnant consume at least 400 µg/day of folate from supplements or fortified foods.
This recommendation aligns with public health strategies to prevent neural tube defects in developing fetuses. While the question asks for a dosage in milligrams (mg), it is important to note that the common recommendation is in micrograms (µg). Therefore, 400 µg is equivalent to 0.4 mg. For other adults not attempting to conceive, the daily requirement of folic acid is typically around 300-400 µg, and this can be met through a balanced diet or supplementation.