What is the purpose of oral folic acid supplementation in pregnant women?

May 23, 2026 Source: Cainiu Health

Dr. Zhang Lu

Introduction

In general, the primary purposes of oral folic acid supplementation in pregnant women include prevention of fetal neural tube defects, prevention of fetal anemia, promotion of fetal growth and development, reduction of pregnancy-related complication risks, and protection of maternal hematopoietic function. Folic acid should be taken strictly as prescribed by a healthcare provider. Pregnant women should adhere to the principle of appropriate dosage: supplementation should begin regularly during the preconception period and continue through the end of the first trimester.

Generally, the primary purposes of oral folic acid supplementation during pregnancy include preventing fetal neural tube defects, preventing fetal anemia, promoting fetal growth and development, reducing the risk of pregnancy complications, and protecting maternal hematopoietic function. Folic acid supplements should be taken strictly as prescribed by a healthcare provider. A detailed analysis follows:

1. Prevention of Fetal Neural Tube Defects

Folic acid participates in nucleic acid synthesis and cellular division and proliferation in the human body. During early pregnancy, the fetal neural tube undergoes rapid differentiation and development. Adequate folic acid intake helps prevent incomplete neural tube closure, thereby reducing the incidence of neural tube defects such as spina bifida and anencephaly, and ensuring normal fetal nervous system development.

2. Prevention of Fetal Anemia

Folic acid is a critical precursor for red blood cell production. Sufficient folic acid supports normal synthesis and maturation of red blood cells in the fetus. Adequate intake prevents megaloblastic anemia caused by folic acid deficiency in the fetus, maintains stability of the fetal circulatory system, and ensures adequate blood supply and oxygen delivery to fetal tissues.

3. Promotion of Fetal Growth and Development

Folic acid plays a key role in protein and nucleic acid metabolism and serves as an essential biochemical foundation for cellular proliferation in fetal tissues and organs. Regular folic acid supplementation supports normal growth of all fetal organs and tissues, facilitates steady fetal development throughout pregnancy, and reduces the risk of intrauterine growth restriction.

4. Reduction of Pregnancy Complication Risk

Adequate folic acid intake during pregnancy helps regulate homocysteine levels in the body, thereby minimizing vascular damage. This contributes to a lower incidence of common pregnancy complications such as gestational hypertension and placental abruption, supporting maternal physiological stability and ensuring a smoother pregnancy course.

5. Protection of Maternal Hematopoietic Function

During pregnancy, maternal blood volume increases significantly, elevating hematopoietic demands. Sufficient folic acid supplementation maintains normal bone marrow hematopoietic function in pregnant women, prevents maternal megaloblastic anemia, sustains adequate maternal blood and qi (vital energy), and supports metabolic requirements throughout pregnancy.

Folic acid supplementation during pregnancy should follow the principle of appropriate dosage—beginning at the preconception stage and continuing through the end of the first trimester. In daily life, women may complement supplementation with folate-rich foods such as spinach, broccoli, and animal liver. A balanced, varied diet combining plant-based and animal-based foods, together with folic acid supplementation, optimally supports both maternal and fetal health.

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