What is the primary purpose of folic acid supplementation in pregnancy?

• A. Improve fertility
• B. Reduce morning sickness
• C. Prevent neural tube defects
• D. Treat iron deficiency anemia

Answer: (C)

The main idea is that folic acid supplementation during pregnancy is aimed at preventing neural tube defects. Neural tube formation happens very early, often before a woman knows she’s pregnant—about the first 3–4 weeks after conception, with final closure usually by day 28. Folate is essential for DNA synthesis and rapid cell division, especially in the developing neural tissue. If folate is insufficient during this critical period, defects like anencephaly or spina bifida can occur. Providing adequate folate beforehand and in early pregnancy reduces the risk of these neural tube defects.

Because of this timing, the recommended approach is to ensure sufficient folate intake before conception and during early pregnancy (for most women, about 400–800 mcg daily preconception and around 600 mcg daily during pregnancy; higher-dose regimens, such as 4 mg daily, are considered for those at very high risk). Folate also participates in red blood cell formation, but the primary reason for supplementation in pregnancy is neural tube defect prevention, not treating iron deficiency anemia or altering fertility or morning sickness.